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class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Indhold</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">flyt til sidebjælken</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">skjul</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Indledning</div> </a> </li> <li id="toc-Klassifikation_af_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Klassifikation_af_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Klassifikation af dobbeltstjerner</span> </div> </a> <button aria-controls="toc-Klassifikation_af_dobbeltstjerner-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Vis/skjul underafsnit Klassifikation af dobbeltstjerner</span> </button> <ul id="toc-Klassifikation_af_dobbeltstjerner-sublist" class="vector-toc-list"> <li id="toc-Klassifikation_efter_observationsmetode" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Klassifikation_efter_observationsmetode"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Klassifikation efter observationsmetode</span> </div> </a> <ul id="toc-Klassifikation_efter_observationsmetode-sublist" class="vector-toc-list"> <li id="toc-Visuelle_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Visuelle_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1</span> <span>Visuelle dobbeltstjerner</span> </div> </a> <ul id="toc-Visuelle_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Astrometriske_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Astrometriske_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2</span> <span>Astrometriske dobbeltstjerner</span> </div> </a> <ul id="toc-Astrometriske_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Spektroskopiske_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Spektroskopiske_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.3</span> <span>Spektroskopiske dobbeltstjerner</span> </div> </a> <ul id="toc-Spektroskopiske_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Formørkelsesvariable_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Formørkelsesvariable_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.4</span> <span>Formørkelsesvariable dobbeltstjerner</span> </div> </a> <ul id="toc-Formørkelsesvariable_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Optiske_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Optiske_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.5</span> <span>Optiske dobbeltstjerner</span> </div> </a> <ul id="toc-Optiske_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Klassifikation_efter_størrelsesforhold" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Klassifikation_efter_størrelsesforhold"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Klassifikation efter størrelsesforhold</span> </div> </a> <ul id="toc-Klassifikation_efter_størrelsesforhold-sublist" class="vector-toc-list"> <li id="toc-Adskilte_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Adskilte_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.1</span> <span>Adskilte dobbeltstjerner</span> </div> </a> <ul id="toc-Adskilte_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Semiadskilte_dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Semiadskilte_dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.2</span> <span>Semiadskilte dobbeltstjerner</span> </div> </a> <ul id="toc-Semiadskilte_dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Kontakt-dobbeltstjerner" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Kontakt-dobbeltstjerner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.3</span> <span>Kontakt-dobbeltstjerner</span> </div> </a> <ul id="toc-Kontakt-dobbeltstjerner-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Dobbeltstjerners_udvikling" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Dobbeltstjerners_udvikling"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Dobbeltstjerners udvikling</span> </div> </a> <ul id="toc-Dobbeltstjerners_udvikling-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Indhold" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Vis/skjul indholdsfortegnelsen" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Vis/skjul indholdsfortegnelsen</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Dobbeltstjerne</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Gå til en artikel på et andet sprog. Tilgængelig på 79 sprog" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-79" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">79 sprog</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Dubbelster" title="Dubbelster – afrikaans" lang="af" hreflang="af" data-title="Dubbelster" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D8%AC%D9%85_%D8%AB%D9%86%D8%A7%D8%A6%D9%8A" title="نجم ثنائي – arabisk" lang="ar" hreflang="ar" data-title="نجم ثنائي" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Estrella_binaria" title="Estrella binaria – asturisk" lang="ast" hreflang="ast" data-title="Estrella binaria" data-language-autonym="Asturianu" data-language-local-name="asturisk" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%B0%D0%B4%D0%B2%D0%BE%D0%B9%D0%BD%D1%8B%D1%8F_%D0%B7%D0%BE%D1%80%D0%BA%D1%96" title="Падвойныя зоркі – belarusisk" lang="be" hreflang="be" data-title="Падвойныя зоркі" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%94%D0%B2%D0%BE%D0%B9%D0%BD%D0%B0_%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Двойна звезда – bulgarsk" lang="bg" hreflang="bg" data-title="Двойна звезда" data-language-autonym="Български" data-language-local-name="bulgarsk" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AF%E0%A7%81%E0%A6%97%E0%A7%8D%E0%A6%AE_%E0%A6%A4%E0%A6%BE%E0%A6%B0%E0%A6%BE" title="যুগ্ম তারা – bengali" lang="bn" hreflang="bn" data-title="যুগ্ম তারা" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Dvostruka_zvijezda" title="Dvostruka zvijezda – bosnisk" lang="bs" hreflang="bs" data-title="Dvostruka zvijezda" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://ca.wikipedia.org/wiki/Estrella_bin%C3%A0ria" title="Estrella binària – catalansk" lang="ca" hreflang="ca" data-title="Estrella binària" data-language-autonym="Català" data-language-local-name="catalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Dvojhv%C4%9Bzda" title="Dvojhvězda – tjekkisk" lang="cs" hreflang="cs" data-title="Dvojhvězda" data-language-autonym="Čeština" data-language-local-name="tjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%98%D0%BA%D0%BA%C4%95%D0%BB%D0%BB%D0%B5_%C3%A7%C4%83%D0%BB%D1%82%C4%83%D1%80" title="Иккĕлле çăлтăр – tjuvasjisk" lang="cv" hreflang="cv" data-title="Иккĕлле çăлтăр" data-language-autonym="Чӑвашла" data-language-local-name="tjuvasjisk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Seren_ddwbl" title="Seren ddwbl – walisisk" lang="cy" hreflang="cy" data-title="Seren ddwbl" data-language-autonym="Cymraeg" data-language-local-name="walisisk" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Doppelstern" title="Doppelstern – tysk" lang="de" hreflang="de" data-title="Doppelstern" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%94%CE%B9%CF%80%CE%BB%CF%8C%CF%82_%CE%B1%CF%83%CF%84%CE%AD%CF%81%CE%B1%CF%82" title="Διπλός αστέρας – græsk" lang="el" hreflang="el" data-title="Διπλός αστέρας" data-language-autonym="Ελληνικά" data-language-local-name="græsk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Binary_star" title="Binary star – engelsk" lang="en" hreflang="en" data-title="Binary star" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Duopa_stelo" title="Duopa stelo – esperanto" lang="eo" hreflang="eo" data-title="Duopa stelo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Estrella_binaria" title="Estrella binaria – spansk" lang="es" hreflang="es" data-title="Estrella binaria" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Kaksikt%C3%A4ht" title="Kaksiktäht – estisk" lang="et" hreflang="et" data-title="Kaksiktäht" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Izar_bitar" title="Izar bitar – baskisk" lang="eu" hreflang="eu" data-title="Izar bitar" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D8%AA%D8%A7%D8%B1%D9%87_%D8%AF%D9%88%D8%AA%D8%A7%DB%8C%DB%8C" title="ستاره دوتایی – persisk" lang="fa" hreflang="fa" data-title="ستاره دوتایی" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Kaksoist%C3%A4hti" title="Kaksoistähti – finsk" lang="fi" hreflang="fi" data-title="Kaksoistähti" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%89toile_binaire" title="Étoile binaire – fransk" lang="fr" hreflang="fr" data-title="Étoile binaire" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/D%C3%A9r%C3%A9alta" title="Déréalta – irsk" lang="ga" hreflang="ga" data-title="Déréalta" data-language-autonym="Gaeilge" data-language-local-name="irsk" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Estrela_binaria" title="Estrela binaria – galicisk" lang="gl" hreflang="gl" data-title="Estrela binaria" data-language-autonym="Galego" data-language-local-name="galicisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%A6%E0%AB%8D%E0%AA%B5%E0%AA%BF%E0%AA%B8%E0%AA%82%E0%AA%97%E0%AB%80_%E0%AA%A4%E0%AA%BE%E0%AA%B0%E0%AB%8B" title="દ્વિસંગી તારો – gujarati" lang="gu" hreflang="gu" data-title="દ્વિસંગી તારો" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9B%D7%95%D7%9B%D7%91_%D7%9B%D7%A4%D7%95%D7%9C" title="כוכב כפול – hebraisk" lang="he" hreflang="he" data-title="כוכב כפול" data-language-autonym="עברית" data-language-local-name="hebraisk" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A6%E0%A5%8D%E0%A4%B5%E0%A4%BF%E0%A4%A4%E0%A4%BE%E0%A4%B0%E0%A4%BE" title="द्वितारा – hindi" lang="hi" hreflang="hi" data-title="द्वितारा" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Dvojna_zvijezda" title="Dvojna zvijezda – kroatisk" lang="hr" hreflang="hr" data-title="Dvojna zvijezda" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/%C3%89twal_bin%C3%A8" title="Étwal binè – haitisk" lang="ht" hreflang="ht" data-title="Étwal binè" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haitisk" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Kett%C5%91scsillag" title="Kettőscsillag – ungarsk" lang="hu" hreflang="hu" data-title="Kettőscsillag" data-language-autonym="Magyar" data-language-local-name="ungarsk" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BF%D6%80%D5%AF%D5%B6%D5%A1%D5%AF%D5%AB_%D5%A1%D5%BD%D5%BF%D5%B2" title="Կրկնակի աստղ – armensk" lang="hy" hreflang="hy" data-title="Կրկնակի աստղ" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Bintang_biner" title="Bintang biner – indonesisk" lang="id" hreflang="id" data-title="Bintang biner" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Duopla_stelo" title="Duopla stelo – ido" lang="io" hreflang="io" data-title="Duopla stelo" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Tv%C3%ADstirni" title="Tvístirni – islandsk" lang="is" hreflang="is" data-title="Tvístirni" data-language-autonym="Íslenska" data-language-local-name="islandsk" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it badge-Q17437796 badge-featuredarticle mw-list-item" title="fremragende artikel"><a href="https://it.wikipedia.org/wiki/Stella_binaria" title="Stella binaria – italiensk" lang="it" hreflang="it" data-title="Stella binaria" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%80%A3%E6%98%9F" title="連星 – japansk" lang="ja" hreflang="ja" data-title="連星" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Lintang_gandha" title="Lintang gandha – javanesisk" lang="jv" hreflang="jv" data-title="Lintang gandha" data-language-autonym="Jawa" data-language-local-name="javanesisk" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D2%9A%D0%BE%D1%81%D0%B0%D1%80%D0%B6%D2%B1%D0%BB%D0%B4%D1%8B%D0%B7" title="Қосаржұлдыз – kasakhisk" lang="kk" hreflang="kk" data-title="Қосаржұлдыз" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%85%E0%B2%B5%E0%B2%B3%E0%B2%BF_%E0%B2%A8%E0%B2%95%E0%B3%8D%E0%B2%B7%E0%B2%A4%E0%B3%8D%E0%B2%B0%E0%B2%97%E0%B2%B3%E0%B3%81" title="ಅವಳಿ ನಕ್ಷತ್ರಗಳು – kannada" lang="kn" hreflang="kn" data-title="ಅವಳಿ ನಕ್ಷತ್ರಗಳು" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%8C%8D%EC%84%B1" title="쌍성 – koreansk" lang="ko" hreflang="ko" data-title="쌍성" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9A%D0%BE%D1%88_%D0%B6%D1%8B%D0%BB%D0%B4%D1%8B%D0%B7" title="Кош жылдыз – kirgisisk" lang="ky" hreflang="ky" data-title="Кош жылдыз" data-language-autonym="Кыргызча" data-language-local-name="kirgisisk" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Stella_binaria" title="Stella binaria – latin" lang="la" hreflang="la" data-title="Stella binaria" data-language-autonym="Latina" data-language-local-name="latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Duebelst%C3%A4r" title="Duebelstär – luxembourgsk" lang="lb" hreflang="lb" data-title="Duebelstär" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxembourgsk" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Dvinar%C4%97_%C5%BEvaig%C5%BEd%C4%97" title="Dvinarė žvaigždė – litauisk" lang="lt" hreflang="lt" data-title="Dvinarė žvaigždė" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Fizik%C4%81l%C4%81_dubultzvaigzne" title="Fizikālā dubultzvaigzne – lettisk" lang="lv" hreflang="lv" data-title="Fizikālā dubultzvaigzne" data-language-autonym="Latviešu" data-language-local-name="lettisk" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%94%D0%B2%D0%BE%D1%98%D0%BD%D0%B0_%D1%95%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Двојна ѕвезда – makedonsk" lang="mk" hreflang="mk" data-title="Двојна ѕвезда" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A6%E0%B5%8D%E0%B4%B5%E0%B4%A8%E0%B5%8D%E0%B4%A6%E0%B5%8D%E0%B4%B5%E0%B4%A8%E0%B4%95%E0%B5%8D%E0%B4%B7%E0%B4%A4%E0%B5%8D%E0%B4%B0%E0%B4%82" title="ദ്വന്ദ്വനക്ഷത്രം – malayalam" lang="ml" hreflang="ml" data-title="ദ്വന്ദ്വനക്ഷത്രം" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Bintang_dedua" title="Bintang dedua – malajisk" lang="ms" hreflang="ms" data-title="Bintang dedua" data-language-autonym="Bahasa Melayu" data-language-local-name="malajisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%80%E1%80%BC%E1%80%9A%E1%80%BA%E1%80%85%E1%80%AF%E1%80%B6%E1%80%90%E1%80%BD%E1%80%B2" title="ကြယ်စုံတွဲ – burmesisk" lang="my" hreflang="my" data-title="ကြယ်စုံတွဲ" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="burmesisk" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Dubbelsteern" title="Dubbelsteern – nedertysk" lang="nds" hreflang="nds" data-title="Dubbelsteern" data-language-autonym="Plattdüütsch" data-language-local-name="nedertysk" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Dubbelster" title="Dubbelster – nederlandsk" lang="nl" hreflang="nl" data-title="Dubbelster" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Dobbeltstjerne" title="Dobbeltstjerne – nynorsk" lang="nn" hreflang="nn" data-title="Dobbeltstjerne" data-language-autonym="Norsk nynorsk" data-language-local-name="nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Dobbeltstjerne" title="Dobbeltstjerne – bokmål" lang="nb" hreflang="nb" data-title="Dobbeltstjerne" data-language-autonym="Norsk bokmål" data-language-local-name="bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nov mw-list-item"><a href="https://nov.wikipedia.org/wiki/Duopli_stele" title="Duopli stele – Novial" lang="nov" hreflang="nov" data-title="Duopli stele" data-language-autonym="Novial" data-language-local-name="Novial" class="interlanguage-link-target"><span>Novial</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Estela_bin%C3%A0ria" title="Estela binària – occitansk" lang="oc" hreflang="oc" data-title="Estela binària" data-language-autonym="Occitan" data-language-local-name="occitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%A6%E0%A9%8B%E0%A8%B9%E0%A8%B0%E0%A8%BE_%E0%A8%A4%E0%A8%BE%E0%A8%B0%E0%A8%BE" title="ਦੋਹਰਾ ਤਾਰਾ – punjabisk" lang="pa" hreflang="pa" data-title="ਦੋਹਰਾ ਤਾਰਾ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabisk" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pih mw-list-item"><a href="https://pih.wikipedia.org/wiki/Binarii_sdar" title="Binarii sdar – Norfuk / Pitkern" lang="pih" hreflang="pih" data-title="Binarii sdar" data-language-autonym="Norfuk / Pitkern" data-language-local-name="Norfuk / Pitkern" class="interlanguage-link-target"><span>Norfuk / Pitkern</span></a></li><li class="interlanguage-link interwiki-pl badge-Q70894304 mw-list-item" title=""><a href="https://pl.wikipedia.org/wiki/Gwiazda_binarna" title="Gwiazda binarna – polsk" lang="pl" hreflang="pl" data-title="Gwiazda binarna" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%AF%D9%88%DB%81%D8%B1%D8%A7_%D8%AA%D8%A7%D8%B1%DB%81" title="دوہرا تارہ – Western Punjabi" lang="pnb" hreflang="pnb" data-title="دوہرا تارہ" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Estrela_bin%C3%A1ria" title="Estrela binária – portugisisk" lang="pt" hreflang="pt" data-title="Estrela binária" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Stea_binar%C4%83" title="Stea binară – rumænsk" lang="ro" hreflang="ro" data-title="Stea binară" data-language-autonym="Română" data-language-local-name="rumænsk" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%94%D0%B2%D0%BE%D0%B9%D0%BD%D0%B0%D1%8F_%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B0" title="Двойная звезда – russisk" lang="ru" hreflang="ru" data-title="Двойная звезда" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Dvojne_i_vi%C5%A1estruke_zvijezde" title="Dvojne i višestruke zvijezde – serbokroatisk" lang="sh" hreflang="sh" data-title="Dvojne i višestruke zvijezde" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Binary_star" title="Binary star – Simple English" lang="en-simple" hreflang="en-simple" data-title="Binary star" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Dvojhviezda" title="Dvojhviezda – slovakisk" lang="sk" hreflang="sk" data-title="Dvojhviezda" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Dvojne_i_vi%C5%A1estruke_zvezde" title="Dvojne i višestruke zvezde – serbisk" lang="sr" hreflang="sr" data-title="Dvojne i višestruke zvezde" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/B%C3%A9ntang_ganda" title="Béntang ganda – sundanesisk" lang="su" hreflang="su" data-title="Béntang ganda" data-language-autonym="Sunda" data-language-local-name="sundanesisk" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Dubbelstj%C3%A4rna" title="Dubbelstjärna – svensk" lang="sv" hreflang="sv" data-title="Dubbelstjärna" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nyota_maradufu" title="Nyota maradufu – swahili" lang="sw" hreflang="sw" data-title="Nyota maradufu" data-language-autonym="Kiswahili" data-language-local-name="swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%87%E0%AE%B0%E0%AF%81%E0%AE%AE_%E0%AE%B5%E0%AE%BF%E0%AE%A3%E0%AF%8D%E0%AE%AE%E0%AF%80%E0%AE%A9%E0%AF%8D" title="இரும விண்மீன் – tamil" lang="ta" hreflang="ta" data-title="இரும விண்மீன்" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B8%84%E0%B8%B9%E0%B9%88" title="ระบบดาวคู่ – thai" lang="th" hreflang="th" data-title="ระบบดาวคู่" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/%C3%87ift_y%C4%B1ld%C4%B1z" title="Çift yıldız – tyrkisk" lang="tr" hreflang="tr" data-title="Çift yıldız" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%9A%D1%83%D1%88_%D0%B9%D0%BE%D0%BB%D0%B4%D1%8B%D0%B7" title="Куш йолдыз – tatarisk" lang="tt" hreflang="tt" data-title="Куш йолдыз" data-language-autonym="Татарча / tatarça" data-language-local-name="tatarisk" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B4%D0%B2%D1%96%D0%B9%D0%BD%D1%96_%D0%B7%D0%BE%D1%80%D1%96" title="Подвійні зорі – ukrainsk" lang="uk" hreflang="uk" data-title="Подвійні зорі" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Qo%CA%BBshaloq_yulduzlar" title="Qoʻshaloq yulduzlar – usbekisk" lang="uz" hreflang="uz" data-title="Qoʻshaloq yulduzlar" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbekisk" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Sao_%C4%91%C3%B4i" title="Sao đôi – vietnamesisk" lang="vi" hreflang="vi" data-title="Sao đôi" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E8%81%94%E6%98%9F" title="联星 – wu-kinesisk" lang="wuu" hreflang="wuu" data-title="联星" data-language-autonym="吴语" data-language-local-name="wu-kinesisk" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%9F%E1%83%98%E1%83%A0%E1%83%9B%E1%83%A3%E1%83%A0%E1%83%98%E1%83%AA%E1%83%AE%E1%83%98" title="ჟირმურიცხი – Mingrelian" lang="xmf" hreflang="xmf" data-title="ჟირმურიცხი" data-language-autonym="მარგალური" data-language-local-name="Mingrelian" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E8%81%AF%E6%98%9F" title="聯星 – kinesisk" lang="zh" hreflang="zh" data-title="聯星" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E9%9B%99%E5%AD%90%E6%98%9F" title="雙子星 – kantonesisk" lang="yue" hreflang="yue" data-title="雙子星" data-language-autonym="粵語" data-language-local-name="kantonesisk" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q50053#sitelinks-wikipedia" title="Redigér sproglinks" class="wbc-editpage">Redigér links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Navnerum"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Dobbeltstjerne" title="Se indholdssiden [c]" accesskey="c"><span>Artikel</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Diskussion:Dobbeltstjerne" rel="discussion" title="Diskussion om indholdet på siden 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class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Fra Wikipedia, den frie encyklopædi</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="da" dir="ltr"><p>En <b>dobbeltstjerne</b> er en gruppe af to (eller flere, trods navnet) <a href="/wiki/Stjerne" title="Stjerne">stjerner</a>, som af den indbyrdes tyngdekraft holdes fast i lukkede banekredsløb om hinanden, ganske som <a href="/wiki/Jorden" title="Jorden">Jorden</a> og de andre <a href="/wiki/Planet" title="Planet">planeter</a> er bundet i kredsløb om <a href="/wiki/Solen" title="Solen">Solen</a>. Fænomenet er meget almindeligt; et sted mellem en fjerdedel og halvdelen af de stjerner man kan observere, er "medlem" af dobbelstjernesystemer med alt fra to til seks stjerner. </p><p>Så vidt man ved, er vores egen Sol ikke en del af et dobbeltstjernesystem, om end det ikke kan udelukkes helt. En eventuel ledsagestjerne må dog være meget lille og lyssvag og have en bane der aldrig eller kun yderst sjældent bringer den indenfor "synsvidde" set fra Jorden. En eventuel ledsagestjerne til Solen er i visse medier givet navnet <a href="/wiki/Nemesis_(astronomi)" title="Nemesis (astronomi)">Nemesis</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Klassifikation_af_dobbeltstjerner">Klassifikation af dobbeltstjerner</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=1" title="Redigér afsnit: Klassifikation af dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=1" title="Edit section's source code: Klassifikation af dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Man kan inddele dobbeltstjerner efter to forskellige systemer: I det ene system sorteres stjernerne efter de observationsmetoder der "afslører" dem som dobbeltstjerner, og i det andet efter de enkelte stjerners størrelse i forhold til afstanden imellem dem. </p> <div class="mw-heading mw-heading3"><h3 id="Klassifikation_efter_observationsmetode">Klassifikation efter observationsmetode</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=2" title="Redigér afsnit: Klassifikation efter observationsmetode" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=2" title="Edit section's source code: Klassifikation efter observationsmetode"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Sirius_A_and_B_Hubble_photo.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Sirius_A_and_B_Hubble_photo.jpg/320px-Sirius_A_and_B_Hubble_photo.jpg" decoding="async" width="320" height="349" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/f/f3/Sirius_A_and_B_Hubble_photo.jpg 1.5x" data-file-width="369" data-file-height="403" /></a><figcaption>Den lysstærke <a href="/wiki/Sirius_(stjerne)" title="Sirius (stjerne)">Sirius</a> og dens langt svagere "ledsager", set med <a href="/wiki/Hubble-teleskopet" class="mw-redirect" title="Hubble-teleskopet">Hubble-teleskopet</a>. Kilde: NASA.</figcaption></figure> <p>I dette system skelner man mellem fire forskellige typer dobbeltstjerner, nemlig <i>visuelle</i>, <i>astrometriske</i>, <i>spektroskopiske</i> og <i>formørkelsesvariable dobbeltstjerner</i>. I dette system kan ét bestemt dobbeltstjernesystem passe ind i mere end én af disse fire kategorier; eksempelvis er en del spektroskopiske dobbeltstjerner også formørkelsesvariable.<br /> Systemet omfatter også en femte kategori, <i>optiske dobbeltstjerner</i>; det er "dobbeltstjerner" der siden har vist sig at være to separate stjerner med vidt forskellige afstande til Jorden. </p> <div class="mw-heading mw-heading4"><h4 id="Visuelle_dobbeltstjerner">Visuelle dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=3" title="Redigér afsnit: Visuelle dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=3" title="Edit section's source code: Visuelle dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Hos nogle, ikke for fjerne dobbelstjerner kan man i <a href="/wiki/Kikkert" title="Kikkert">kikkerter</a> eller <a href="/wiki/Teleskop" class="mw-redirect" title="Teleskop">teleskoper</a> direkte se de enkelte "medlemmer" af systemet, og over tid følge deres indbyrdes bevægelser. Denne type dobbeltstjerner kaldes for <i>visuelle dobbeltstjerner</i>. </p> <div class="mw-heading mw-heading4"><h4 id="Astrometriske_dobbeltstjerner">Astrometriske dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=4" title="Redigér afsnit: Astrometriske dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=4" title="Edit section's source code: Astrometriske dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>For en del af de "ægte" dobbeltstjerners vedkommende er kun den ene eller nogle af systemets "medlemmer" synlige fra Jorden, men i disse tilfælde kan eventuelle "usynlige dansepartnere" afsløres ved uregelmæssigheder i de synlige stjerners indbyrdes bevægelser: Den slags dobbeltstjerner omtales som <i>astrometriske dobbeltstjerner</i>.<br /> Et berømt eksempel på dette er <a href="/wiki/Sirius_(stjerne)" title="Sirius (stjerne)">Sirius</a>, eller "Hundestjernen" i stjernebilledet <a href="/wiki/Store_Hund" title="Store Hund">Store Hund</a> (Canis Major): Man opdagede at stjernen "slingrer", og antog at Sirius kredsede rundt om et eller andet temmelig tungt legeme. Sidenhen, i <a href="/wiki/1862" title="1862">1862</a>, opdagede man "ledsageren", stort set på det sted hvor den ifølge beregninger "burde" være. </p> <div class="mw-heading mw-heading4"><h4 id="Spektroskopiske_dobbeltstjerner">Spektroskopiske dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=5" title="Redigér afsnit: Spektroskopiske dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=5" title="Edit section's source code: Spektroskopiske dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I andre tilfælde står begge/alle stjerner i et dobbeltstjernesystem så tæt, at man ikke kan observere deres indbyrdes bevægelser. Men ved at undersøge <a href="/wiki/Spektrum" class="mw-disambig" title="Spektrum">spektret</a> for det lys stjernen udsender, kan man afsløre at spektret indeholder en "sammenblanding" af flere forskellige stjerners spektrale "fingeraftryk". Dobbeltstjerner der "afsløres" på denne måde, kaldes for <i>spektroskopiske dobbeltstjerner</i>.<br /> Da stjernerne bevæger sig omkring hinanden, vil <a href="/wiki/Dopplereffekt" title="Dopplereffekt">dopplereffekten</a> bevirke at de karakteristiske <i>linjer</i> (svarende til bestemte bølgelængder) i deres spektre flytter sig lidt med tiden. Selv om ikke begge/alle stjerner i et dobbeltstjernesystem set fra Jorden er lysstærke nok til at man kan foretage spektralanalyse, kan man som med de astrometriske dobbeltstjerner regne sig frem til de øvrige stjerners baner og egenskaber. </p> <div class="mw-heading mw-heading4"><h4 id="Formørkelsesvariable_dobbeltstjerner"><span id="Form.C3.B8rkelsesvariable_dobbeltstjerner"></span>Formørkelsesvariable dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=6" title="Redigér afsnit: Formørkelsesvariable dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=6" title="Edit section's source code: Formørkelsesvariable dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fil:Eclipsing_binary_star_animation_2.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/0/07/Eclipsing_binary_star_animation_2.gif" decoding="async" width="160" height="120" class="mw-file-element" data-file-width="160" data-file-height="120" /></a><figcaption>Animation af en formørkelsesvariabel stjerne og dens samlede lysstyrke.</figcaption></figure> <p>I enkelte tilfælde cirkler to stjerner rundt om hinanden i en <a href="/wiki/Plan_(matematik)" title="Plan (matematik)">plan</a> der ligger meget nær sigtelinjen mod Jorden: Set herfra vil de to stjerner på skift passere ind foran hinanden som det er vist til højre. Når den ene stjerne på denne måde helt eller delvis skjuler lyset fra den anden, modtager en observatør på Jorden mindre lys end på tidspunkter hvor begge stjerner er fuldt synlige. Nederst på illustrationen til højre ses hvordan den samlede lysstyrke fra dobbeltstjernen falder kortvarigt hver gang den ene stjerne kommer ind foran den anden.<br /> Hvis sådan en dobbeltstjerne ligger tilstrækkelig langt fra Jorden, kan end ikke de beste teleskoper direkte vise at der <i>er</i> to stjerner; det eneste der "afslører" at der er tale om en dobbeltstjerne, er de regelmæssige "dyk" i det samlede lys vi modtager fra begge stjerner. Sådanne stjerner kaldes for <i>formørkelsesvariable dobbeltstjerner</i>, og ud fra tiden imellem, og forløbet af, disse "dyk" i lysintensisteten kan man beregne en række oplysninger om parret: Omløbstid, stjernernes indbyrdes størrelsesforhold, baneplanets vinkel med synslinjen til Jorden m.fl. </p> <div class="mw-heading mw-heading4"><h4 id="Optiske_dobbeltstjerner">Optiske dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=7" title="Redigér afsnit: Optiske dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=7" title="Edit section's source code: Optiske dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Det forekommer at to stjerner står meget tæt på hinanden på himlen set fra Jorden, mens den ene stjerne i virkeligheden er meget længere væk fra Jorden end den anden. I visse tilfælde af denne art har man formodet at talen var om en dobbeltstjerne, mens forbedrede observationsmetoder siden hen har påvist at dette ikke er tilfældet: Den slags "falske" dobbeltstjerner omtales som <i>optiske dobbeltstjerner</i>. </p> <div class="mw-heading mw-heading3"><h3 id="Klassifikation_efter_størrelsesforhold"><span id="Klassifikation_efter_st.C3.B8rrelsesforhold"></span>Klassifikation efter størrelsesforhold</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=8" title="Redigér afsnit: Klassifikation efter størrelsesforhold" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=8" title="Edit section's source code: Klassifikation efter størrelsesforhold"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I dette klassifikationssystem sorteres dobbeltstjernerne efter hvor tæt de er på hinanden (set i forhold til deres størrelse): Jo tættere stjernerne er på hinanden, desto mere påvirker de hinanden med deres tyngdekraft og "atmosfære" — i visse tilfælde kredser stjernerne så tæt om hinanden, at der overføres materiale (<a href="/wiki/Gas" title="Gas">gas</a> og <a href="/wiki/Plasma" title="Plasma">plasma</a>) fra overfladen af den ene stjerne til den anden. </p> <div class="mw-heading mw-heading4"><h4 id="Adskilte_dobbeltstjerner">Adskilte dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=9" title="Redigér afsnit: Adskilte dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=9" title="Edit section's source code: Adskilte dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I et adskilt dobbeltstjernesystem afstanden mellem stjernerne stor i forhold til stjernernes størrelse; så stor at stjernerne ikke påvirker hinanden ud over det at de kredser om hinanden: Stjerner i sådanne systemer udvikler sig som de ville gøre hvis de var to enkeltstående stjerner "hver for sig". </p> <div class="mw-heading mw-heading4"><h4 id="Semiadskilte_dobbeltstjerner">Semiadskilte dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=10" title="Redigér afsnit: Semiadskilte dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=10" title="Edit section's source code: Semiadskilte dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I semiadskilte dobbeltstjerner er den ene stjerne så stor, at noget af det gas og plasma der findes i stjernens yderste lag kommer udenfor stjernens såkaldte <a href="/w/index.php?title=Roche-gr%C3%A6nse&action=edit&redlink=1" class="new" title="Roche-grænse (ikke skrevet endnu)">Roche-grænse</a>: Herude er tyngdekraften fra den stjerne som stoffet kommer fra, ikke længere stærkere end tyngdekraften fra den anden stjerne, og stoffet vil nu "falde ned" på den anden stjerne. </p> <div class="mw-heading mw-heading4"><h4 id="Kontakt-dobbeltstjerner">Kontakt-dobbeltstjerner</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=11" title="Redigér afsnit: Kontakt-dobbeltstjerner" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=11" title="Edit section's source code: Kontakt-dobbeltstjerner"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>I kontakt-dobbeltstjerner udfylder begge stjerner deres Roche-grænser: De yderste lag af gas og plasma i de to stjerner "smelter sammen" til en fælles stjerne-atmosfære der omgiver begge parter. Denne "fælles atmosfære" kan skabe friktion og "bremse" stjernernes indbyrdes bevægelser, med den konsekvens at de efter nogen tid forenes til én stjerne. </p> <div class="mw-heading mw-heading2"><h2 id="Dobbeltstjerners_udvikling">Dobbeltstjerners udvikling</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dobbeltstjerne&veaction=edit&section=12" title="Redigér afsnit: Dobbeltstjerners udvikling" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Dobbeltstjerne&action=edit&section=12" title="Edit section's source code: Dobbeltstjerners udvikling"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Beregninger viser, at selv om det ikke er helt umuligt for flere stjerner at "mødes tilfældigt" i rummet, og derefter forblive sammen som et dobbeltstjernesystem, så kræver det ganske særlige omstændigheder og er derfor temmelig usandsynligt. Derfor hælder man til den teori, at dobbeltstjernesystemer primært dannes ved, at den gassky der er forstadiet til alle stjerner, brydes op i flere dele tidligt i dannelsesprocessen. Studier af "unge" dobbeltstjernesystemer synes at understøtte denne teori. </p><p>Hen imod slutningen af sit "liv" vokser en hovedserie-stjerne temmelig voldsomt: Mens stjernen i sit "hovedserie-liv" havde god plads indenfor sin egen Roche-grænse, kan den i et dobbeltstjernesystem vokse så meget at den taber stof ud over Roche-grænsen, som derefter enten falder direkte "ned" på den anden stjerne, eller opsamles i en <a href="/w/index.php?title=Tilv%C3%A6kstskive&action=edit&redlink=1" class="new" title="Tilvækstskive (ikke skrevet endnu)">tilvækstskive</a> omkring den stjerne der modtager stoffet. I tilvækstskiven omsættes det faldende stofs <a href="/wiki/Mekanisk_energi" title="Mekanisk energi">mekaniske energi</a> til <a href="/wiki/Elektromagnetisk_str%C3%A5ling" title="Elektromagnetisk stråling">elektromagnetisk stråling</a>, nogle gange så meget at skiven udsender mere lys end stjernerne selv. </p><p>Da en stjernes "livsforløb" afgøres af hvor meget "stof" den indeholder, kan den slags materialeudveksling mellem stjernerne ændre deres "skæbne". Sådanne stof-udvekslinger gør det endda muligt for stjerner i dobbeltstjernesystemer at nå specielle udviklingstrin som ikke er mulige for stjerner der ikke er en del af et dobbeltstjernesystem. </p><p>I nogle semiadskilte dobbeltstjerner overføres der materiale til overfladen af en ellers "død" <a href="/wiki/Hvid_dv%C3%A6rg" title="Hvid dværg">hvid dværgstjerne</a>, hvorved denne kan "blusse op" i et <a href="/w/index.php?title=Nova_(astronomi)&action=edit&redlink=1" class="new" title="Nova (astronomi) (ikke skrevet endnu)">nova</a>-udbrud, eller i ekstreme tilfælde ende i en <a href="/wiki/Supernova" title="Supernova">supernova</a>-eksplosion. </p> <table class="infobox sisterproject"> <tbody><tr> <td style="width:50px; height:67px;"><figure class="mw-halign-none" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/50px-Commons-logo.svg.png" decoding="async" width="50" height="67" class="mw-file-element" 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