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interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Variable_doble_peri%C3%B2dica" title="Variable doble periòdica – Catalan" lang="ca" hreflang="ca" data-title="Variable doble periòdica" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Doppelperiodischer_Ver%C3%A4nderlicher" title="Doppelperiodischer Veränderlicher – German" lang="de" hreflang="de" data-title="Doppelperiodischer Veränderlicher" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9D%B4%EC%A4%91%EC%A3%BC%EA%B8%B0_%EB%B3%80%EA%B4%91%EC%84%B1" title="이중주기 변광성 – Korean" lang="ko" hreflang="ko" data-title="이중주기 변광성" data-language-autonym="한국어" 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class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B5%D0%BC%D0%B5%D0%BD%D0%BD%D1%8B%D0%B5_%D0%B7%D0%B2%D1%91%D0%B7%D0%B4%D1%8B_%D0%B4%D0%B2%D0%BE%D0%B9%D0%BD%D0%BE%D0%B9_%D0%BF%D0%B5%D1%80%D0%B8%D0%BE%D0%B4%D0%B8%D1%87%D0%BD%D0%BE%D1%81%D1%82%D0%B8" title="Переменные звёзды двойной периодичности – Russian" lang="ru" hreflang="ru" data-title="Переменные звёзды двойной периодичности" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%97%D0%BC%D1%96%D0%BD%D0%BD%D1%96_%D0%B7%D0%BE%D1%80%D1%96_%D0%BF%D0%BE%D0%B4%D0%B2%D1%96%D0%B9%D0%BD%D0%BE%D1%97_%D0%BF%D0%B5%D1%80%D1%96%D0%BE%D0%B4%D0%B8%D1%87%D0%BD%D0%BE%D1%81%D1%82%D1%96" title="Змінні зорі подвійної періодичності – Ukrainian" lang="uk" hreflang="uk" data-title="Змінні зорі подвійної періодичності" 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<div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</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="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 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.ambox{display:none!important}}</style><table class="box-More_footnotes_needed plainlinks metadata ambox ambox-style ambox-More_footnotes_needed" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/40px-Text_document_with_red_question_mark.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/60px-Text_document_with_red_question_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/80px-Text_document_with_red_question_mark.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article includes a list of <a href="/wiki/Wikipedia:Citing_sources#General_references" title="Wikipedia:Citing sources">general references</a>, but <b>it lacks sufficient corresponding <a href="/wiki/Wikipedia:Citing_sources#Inline_citations" title="Wikipedia:Citing sources">inline citations</a></b>.<span class="hide-when-compact"> Please help to <a href="/wiki/Wikipedia:WikiProject_Reliability" title="Wikipedia:WikiProject Reliability">improve</a> this article by <a href="/wiki/Wikipedia:When_to_cite" title="Wikipedia:When to cite">introducing</a> more precise citations.</span> <span class="date-container"><i>(<span class="date">July 2019</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>A <b>Double Periodic Variable</b> (DPV) is a type of <a href="/wiki/Binary_star" title="Binary star">binary star</a>. As the name implies, the systems vary in brightness not only due to eclipses of one star by the other, but also on a cycle of roughly 33 times longer than the orbit. The star gaining mass from the other has a thick disk of material surrounding it, and the systems apparently lose mass cyclically into the <a href="/wiki/Interstellar_medium" title="Interstellar medium">interstellar medium</a> over time. The cause for the secondary longer variability still is not established, but it has been proposed to be linked to a magnetic dynamo in the donor (mass transferring) star. A famous example is <a href="/wiki/Beta_Lyrae" title="Beta Lyrae">β Lyrae</a>. The stars are rare, with 21 systems found in the Galaxy and more than 170 in the Magellanic Clouds (Abril 2016). </p> <div class="mw-heading mw-heading2"><h2 id="List">List</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_periodic_variable&action=edit&section=1" title="Edit section: List"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div><p> Catalogues of Double Periodic Variables are given by Mennickent, Otero and Kołaczkowski (2016), Pawlak et al. (2013) and Poleski et al. (2010). Some few examples are given below.<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"></p><table class="plainlinks metadata ambox mbox-small-left ambox-notice" role="presentation" style="width: auto;"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/1/1d/Information_icon4.svg/20px-Information_icon4.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/1/1d/Information_icon4.svg/30px-Information_icon4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/1/1d/Information_icon4.svg/40px-Information_icon4.svg.png 2x" data-file-width="620" data-file-height="620" /></span></span></td><td class="mbox-text" style="width: auto;"><div class="mbox-text-span">This list is <a href="/wiki/Wikipedia:WikiProject_Lists#Incomplete_lists" title="Wikipedia:WikiProject Lists">incomplete</a>; you can help by <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Double_periodic_variable&action=edit">adding missing items</a>. <span class="date-container"><i>(<span class="date">April 2016</span>)</i></span></div></td></tr></tbody></table> <p>The following list contains selected double periodic variables that are of interest to amateur or professional astronomy. Unless otherwise noted, the given magnitudes are in the <a href="/wiki/Apparent_magnitude#Standard_reference_values" title="Apparent magnitude">V-band</a>. </p> <table border="1" class="wikitable sortable" style="width:95%; text-align:center;"> <tbody><tr> <th>Star<br /> </th> <th>Maximum<br /><a href="/wiki/Apparent_Magnitude" class="mw-redirect" title="Apparent Magnitude">magnitude</a><br /> </th> <th>Minimum<br />magnitude<br /> </th> <th>Eclipse period<br />(in days)<br /> </th> <th>Spectral<br />type </th></tr> <tr> <td><a href="/w/index.php?title=V393_Scorpii&action=edit&redlink=1" class="new" title="V393 Scorpii (page does not exist)">V393 Scorpii</a> </td> <td>7.39 </td> <td>8.31 </td> <td>7.72 </td> <td>B3III </td></tr> <tr> <td><a href="/wiki/AU_Monocerotis" class="mw-redirect" title="AU Monocerotis">AU Monocerotis</a> </td> <td>8.20 </td> <td>9.16 </td> <td>11.11 </td> <td>B5IV+F8-G0II-III </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_periodic_variable&action=edit&section=2" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Mennickent, R.E., 2017, Long Photometric Cycles in Hot Algols, Serbian Astronomical Journal 194, 1</li> <li>Schleicher, D., Mennickent, R.E., 2017, A dynamo mechanism as the potential origin of the long cycle in double periodic variables, Astronomy and Astrophysics, 602, A109.</li> <li>Mennickent, R.E., Otero, S., Kolaczkowski, Z., 2016, Interacting binaries W Serpentids and double periodic variables, Monthly Notices of the Royal Astronomical Society, Volume 455, Issue 2, p. 1728-1745.</li> <li>Otero, S.A., Watson, C., Wils, P., <a rel="nofollow" class="external text" href="http://www.aavso.org/vsx/index.php?view=about.vartypes">Variable Star Type Designations in the VSX</a>. <i>AAVSO Website</i>. <a rel="nofollow" class="external text" href="https://www.aavso.org">American Association of Variable Star Observers</a>. Retrieved 11 May 2014.</li> <li>Pawlak, M., et al. 2013, Eclipsing Binary Stars in the OGLE-III Fields of the Small Magellanic Cloud, Acta Astronomica, vol 63, no 3, p. 323-338.</li> <li>Poleski, R. et al. 2010, The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. X. Enigmatic Class of Double Periodic Variables in the Large Magellanic Cloud, Acta Astronomica, vol 60, no 3, p. 179-196.</li> <li>Mennickent, R.E., Pietrzynski, G., Diaz, M, Gieren, W., 2003, Double-periodic blue variables in the Magellanic Clouds, Astronomy and Astrophysics, v.399, p. L47-L50. (Discovery paper).</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist 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class="navbox-group" style="width:1%"><a href="/wiki/Stellar_pulsation" title="Stellar pulsation">Pulsating</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cepheid_variable" title="Cepheid variable">Cepheids</a> and<br />cepheid-like</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Type_I_Cepheid" class="mw-redirect" title="Type I Cepheid">Type I</a> <small>(<a href="/wiki/Classical_Cepheid_variable" title="Classical Cepheid variable">Classical cepheids</a>, <a href="/wiki/Delta_Scuti_variable" title="Delta Scuti variable">Delta Scuti</a>)</small></li> <li><a href="/wiki/Type_II_Cepheid" title="Type II Cepheid">Type II</a> <small>(<a href="/wiki/BL_Herculis_variable" title="BL Herculis variable">BL Herculis</a>, <a href="/wiki/W_Virginis_variable" title="W Virginis variable">W Virginis</a>, <a href="/wiki/RV_Tauri_variable" title="RV Tauri variable">RV Tauri</a>)</small></li> <li><a href="/wiki/RR_Lyrae_variable" title="RR Lyrae variable">RR Lyrae</a></li> <li><a href="/wiki/Rapidly_oscillating_Ap_star" title="Rapidly oscillating Ap star">Rapidly oscillating Ap</a></li> <li><a href="/wiki/SX_Phoenicis_variable" title="SX Phoenicis variable">SX Phoenicis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Blue-white with<br />early spectra</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alpha_Cygni_variable" title="Alpha Cygni variable">Alpha Cygni</a></li> <li><a href="/wiki/Beta_Cephei_variable" title="Beta Cephei variable">Beta Cephei</a></li> <li><a href="/wiki/Slowly_pulsating_B-type_star" title="Slowly pulsating B-type star">Slowly pulsating B-type</a></li> <li><a href="/wiki/PV_Telescopii_variable" title="PV Telescopii variable">PV Telescopii</a></li> <li><a href="/wiki/Blue_large-amplitude_pulsator" title="Blue large-amplitude pulsator">Blue large-amplitude pulsator</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Long-period_variable_star" title="Long-period variable star">Long-period</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Mira_variable" title="Mira variable">Mira</a></li> <li><a href="/wiki/Semiregular_variable_star" title="Semiregular variable star">Semiregular</a></li> <li><a href="/wiki/Slow_irregular_variable" title="Slow irregular variable">Slow irregular</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gamma_Doradus_variable" title="Gamma Doradus variable">Gamma Doradus</a></li> <li><a href="/wiki/Solar-like_oscillations" title="Solar-like oscillations">Solar-like oscillations</a></li> <li><a href="/wiki/Pulsating_white_dwarf" title="Pulsating white dwarf">White dwarf</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Eruptive</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Pre-main-sequence_star" title="Pre-main-sequence star">Protostar</a> and <a href="/wiki/Pre-main-sequence_star" title="Pre-main-sequence star">PMS</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Herbig_Ae/Be_star" title="Herbig Ae/Be star">Herbig Ae/Be</a></li> <li><a href="/wiki/Orion_variable" title="Orion variable">Orion</a> <ul><li><small><a href="/wiki/FU_Orionis_star" title="FU Orionis star">FU Orionis</a></small></li> <li><small><a href="/wiki/T_Tauri_star" title="T Tauri star">T Tauri</a></small></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Giants and<br />supergiants</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Luminous_blue_variable" title="Luminous blue variable">Luminous blue variable</a></li> <li><a href="/wiki/R_Coronae_Borealis_variable" title="R Coronae Borealis variable">R Coronae Borealis</a> <small>(<a href="/wiki/DY_Persei_variable" title="DY Persei variable">DY Persei</a>)</small></li> <li><a href="/wiki/Yellow_hypergiant" title="Yellow hypergiant">Yellow hypergiant</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Eruptive binary</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Double periodic</a></li> <li><a href="/wiki/FS_Canis_Majoris_variable" title="FS Canis Majoris variable">FS Canis Majoris</a></li> <li><a href="/wiki/RS_Canum_Venaticorum_variable" title="RS Canum Venaticorum variable">RS Canum Venaticorum</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Flare_star" title="Flare star">Flare</a></li> <li><a href="/wiki/Gamma_Cassiopeiae_variable" title="Gamma Cassiopeiae variable">Gamma Cassiopeiae</a></li> <li><a href="/wiki/Lambda_Eridani_variable" title="Lambda Eridani variable">Lambda Eridani</a></li> <li><a href="/wiki/Wolf%E2%80%93Rayet_star" title="Wolf–Rayet star">Wolf–Rayet</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cataclysmic_variable_star" title="Cataclysmic variable star">Cataclysmic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AM_Canum_Venaticorum_star" title="AM Canum Venaticorum star">AM Canum Venaticorum</a></li> <li><a href="/wiki/Dwarf_nova" title="Dwarf nova">Dwarf nova</a></li> <li><a href="/wiki/Luminous_red_nova" title="Luminous red nova">Luminous red nova</a></li> <li><a href="/wiki/Nova" title="Nova">Nova</a></li> <li><a href="/wiki/Polar_(star)" title="Polar (star)">Polar</a> <ul><li><small><a href="/wiki/Intermediate_polar" title="Intermediate polar">Intermediate</a></small></li></ul></li> <li><a href="/wiki/Supernova" title="Supernova">Supernova</a> <ul><li><small><a href="/wiki/Hypernova" title="Hypernova">Hypernova</a></small></li></ul></li> <li><a href="/wiki/SW_Sextantis_variable" title="SW Sextantis variable">SW Sextantis</a></li> <li><a href="/wiki/Symbiotic_binary" title="Symbiotic binary">Symbiotic</a> <ul><li><small><a href="/wiki/Symbiotic_nova" title="Symbiotic nova">Symbiotic nova</a></small></li> <li><small><a href="/wiki/Symbiotic_binary" title="Symbiotic binary">Z Andromedae</a></small></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Rotating</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Non-spherical</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Rotating_ellipsoidal_variable" title="Rotating ellipsoidal variable">Rotating ellipsoidal</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Stellar spots</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/BY_Draconis_variable" title="BY Draconis variable">BY Draconis</a></li> <li><a href="/wiki/Variable_star#FK_Comae_Berenices_variables" title="Variable star">FK Comae Berenices</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Magnetic fields</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alpha2_Canum_Venaticorum_variable" title="Alpha2 Canum Venaticorum variable">α<sup>2</sup> Canum Venaticorum</a></li> <li><a href="/wiki/Pulsar" title="Pulsar">Pulsar</a></li> <li><a href="/wiki/SX_Arietis_variable" title="SX Arietis variable">SX Arietis</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Binary_star#Eclipsing_binaries" title="Binary star">Eclipsing</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Algol_variable" title="Algol variable">Algol</a></li> <li><a href="/wiki/Beta_Lyrae_variable" title="Beta Lyrae variable">Beta Lyrae</a></li> <li><a href="/wiki/Planetary_transit_variable" class="mw-redirect" title="Planetary transit variable">Planetary transit</a></li> <li><a href="/wiki/W_Ursae_Majoris_variable" title="W Ursae Majoris variable">W Ursae Majoris</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><b><span class="nowrap"><span class="noviewer" typeof="mw:File"><a 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