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href="/wiki/Constelaci%C3%B3n" title="Constelación">Constelación</a></b> </td> <td><a href="/wiki/Casiopea_(constelaci%C3%B3n)" title="Casiopea (constelación)">Casiopea</a> </td></tr> <tr style="vertical-align: top;"> <td style="padding-right:1em;"><b><a href="/wiki/Ascensi%C3%B3n_recta" title="Ascensión recta">Ascensión recta</a> α </b> </td> <td>23h 58min 01,32s </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Declinaci%C3%B3n_(astronom%C3%ADa)" title="Declinación (astronomía)">Declinación</a> δ </b> </td> <td>+56º 29’ 13,4’’ </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Distancia" title="Distancia">Distancia</a></b> </td> <td>2000 - 3160 <a href="/wiki/A%C3%B1o_luz" title="Año luz">años luz</a> </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Magnitud_visual" class="mw-redirect" title="Magnitud visual">Magnitud visual</a></b> </td> <td>+10,0 (<a href="/wiki/Banda_B" title="Banda B">banda B</a>) </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Magnitud_absoluta" title="Magnitud absoluta">Magnitud absoluta</a></b> </td> <td>-5,50 (<a href="/wiki/Magnitud_bolom%C3%A9trica" title="Magnitud bolométrica">bolométrica</a>) </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Luminosidad" title="Luminosidad">Luminosidad</a></b> </td> <td>6700 soles </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Temperatura_efectiva" title="Temperatura efectiva">Temperatura</a></b> </td> <td>2200 <a href="/wiki/Kelvin" title="Kelvin">K</a> </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Radio_(geometr%C3%ADa)" title="Radio (geometría)">Radio</a></b> </td> <td>575 soles </td></tr> <tr style="vertical-align: top;"> <td><b><a href="/wiki/Tipo_espectral" class="mw-redirect" title="Tipo espectral">Tipo espectral</a></b> </td> <td>S6.5pe </td></tr></tbody></table> <p><b>WY Cassiopeiae</b> (WY Cas / CSS 1345 / <a href="/wiki/Guide_Star_Catalogue" class="mw-redirect" title="Guide Star Catalogue">GSC</a> 04009-01430)<sup id="cite_ref-1" class="reference separada"><a href="#cite_note-1"><span class="corchete-llamada">[</span>1<span class="corchete-llamada">]</span></a></sup> es una <a href="/wiki/Estrella_variable" title="Estrella variable">estrella variable</a> en la <a href="/wiki/Constelaci%C3%B3n" title="Constelación">constelación</a> de <a href="/wiki/Casiopea_(constelaci%C3%B3n)" title="Casiopea (constelación)">Casiopea</a>. Al ser una estrella distante, su distancia respecto al <a href="/wiki/Sistema_solar" title="Sistema solar">sistema solar</a> es incierta; diversas fuentes dan una cifra comprendida entre 2000<sup id="cite_ref-Ramstedt_2-0" class="reference separada"><a href="#cite_note-Ramstedt-2"><span class="corchete-llamada">[</span>2<span class="corchete-llamada">]</span></a></sup> y 3160 <a href="/wiki/A%C3%B1os_luz" class="mw-redirect" title="Años luz">años luz</a>.<sup id="cite_ref-Guandalini2010_3-0" class="reference separada"><a href="#cite_note-Guandalini2010-3"><span class="corchete-llamada">[</span>3<span class="corchete-llamada">]</span></a></sup> </p><p>De <a href="/wiki/Tipo_espectral" class="mw-redirect" title="Tipo espectral">tipo espectral</a> S6.5pe, WY Cassiopeiae es una <a href="/wiki/Estrella_de_tipo_S" title="Estrella de tipo S">estrella de tipo S</a> —como <a href="/wiki/Pi1_Gruis" title="Pi1 Gruis">π<sup>1</sup> Gruis</a> o <a href="/wiki/Ji_Cygni" title="Ji Cygni">χ Cygni</a>— con una <a href="/wiki/Temperatura_efectiva" title="Temperatura efectiva">temperatura superfical</a> de sólo 2200 <a href="/wiki/Kelvin" title="Kelvin">K</a>. Su <a href="/wiki/Luminosidad" title="Luminosidad">luminosidad</a> es 6700 veces superior a la <a href="/wiki/Luminosidad_solar" title="Luminosidad solar">luminosidad solar</a>.<sup id="cite_ref-Ramstedt_2-1" class="reference separada"><a href="#cite_note-Ramstedt-2"><span class="corchete-llamada">[</span>2<span class="corchete-llamada">]</span></a></sup> En la actualidad, <a href="/wiki/P%C3%A9rdida_de_masa_estelar" title="Pérdida de masa estelar">pierde masa estelar</a> a razón de 2,26 × 10<sup>-6</sup> <a href="/wiki/Masas_solares" class="mw-redirect" title="Masas solares">masas solares</a> por año.<sup id="cite_ref-Guandalini2010_3-1" class="reference separada"><a href="#cite_note-Guandalini2010-3"><span class="corchete-llamada">[</span>3<span class="corchete-llamada">]</span></a></sup> Otra característica de estas estrellas es su gran tamaño; el radio de WY Cassiopeiae es ~ 575 veces más grande que el <a href="/wiki/Radio_solar" title="Radio solar">radio solar</a>, equivalente a 2,7 <a href="/wiki/Unidad_astron%C3%B3mica" title="Unidad astronómica">UA</a>; si estuviese en el lugar del <a href="/wiki/Sol" title="Sol">Sol</a>, las <a href="/wiki/%C3%93rbita" title="Órbita">órbitas</a> de los cuatro planetas interiores quedarían englobadas en el interior de la estrella. </p><p>WY Cassiopeiae es una <a href="/wiki/Estrella_variable_Mira" title="Estrella variable Mira">variable Mira</a> cuyo brillo oscila entre <a href="/wiki/Magnitud_aparente" title="Magnitud aparente">magnitud</a> +10,0 y +16,9 a lo largo de un período de 476,56 días.<sup id="cite_ref-4" class="reference separada"><a href="#cite_note-4"><span class="corchete-llamada">[</span>4<span class="corchete-llamada">]</span></a></sup> En estas variables —cuyo prototipo es la conocida <a href="/wiki/Mira_(estrella)" title="Mira (estrella)">Mira</a> (ο Ceti)— la inestabilidad proviene de <a href="/wiki/Estrella_variable_pulsante" title="Estrella variable pulsante">pulsaciones</a> en la superficie estelar, lo que provoca cambios de color y brillo. Algunas de ellas, entre las que se encuentran <a href="/wiki/R_Cassiopeiae" title="R Cassiopeiae">R Cassiopeiae</a>, <a href="/wiki/S_Cassiopeiae" title="S Cassiopeiae">S Cassiopeiae</a> así como la propia WY Cassiopeiae, muestran emisión <a href="/w/index.php?title=M%C3%A1ser_(astrof%C3%ADsica)&action=edit&redlink=1" class="new" title="Máser (astrofísica) (aún no redactado)">máser</a> de SiO.<sup id="cite_ref-Ramstedt_2-2" class="reference separada"><a href="#cite_note-Ramstedt-2"><span class="corchete-llamada">[</span>2<span class="corchete-llamada">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Véase_también"><span id="V.C3.A9ase_tambi.C3.A9n"></span>Véase también</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=WY_Cassiopeiae&action=edit&section=1" title="Editar sección: Véase también"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Lista_de_estrellas_variables" class="mw-redirect" title="Lista de estrellas variables">Lista de estrellas variables</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referencias">Referencias</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=WY_Cassiopeiae&action=edit&section=2" title="Editar sección: Referencias"><span>editar</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="listaref" style="list-style-type: decimal;"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=WY+Cas&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id">V* WY Cas -- Variable Star of Mira Cet type</a> (<a href="/wiki/SIMBAD" title="SIMBAD">SIMBAD</a>)</span> </li> <li id="cite_note-Ramstedt-2"><span class="mw-cite-backlink">↑ <a href="#cite_ref-Ramstedt_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Ramstedt_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Ramstedt_2-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><span id="CITAREFRamstedt,_S.;_Schöier,_F._L.;_Olofsson,_H.2009" class="citation publicación">Ramstedt, S.; Schöier, F. L.; Olofsson, H. (2009). <a rel="nofollow" class="external text" href="http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009A%26A...499..515R&db_key=AST&nosetcookie=1">«Circumstellar molecular line emission from S-type AGB stars: mass-loss rates and SiO abundances»</a>. <i><a href="/wiki/Astronomy_and_Astrophysics" title="Astronomy and Astrophysics">Astronomy and Astrophysics</a></i> <b>499</b> (2). <small>515-527</small>.</span><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fes.wikipedia.org%3AWY+Cassiopeiae&rft.atitle=Circumstellar+molecular+line+emission+from+S-type+AGB+stars%3A+mass-loss+rates+and+SiO+abundances&rft.au=Ramstedt%2C+S.%3B+Sch%C3%B6ier%2C+F.+L.%3B+Olofsson%2C+H.&rft.aulast=Ramstedt%2C+S.%3B+Sch%C3%B6ier%2C+F.+L.%3B+Olofsson%2C+H.&rft.date=2009&rft.genre=article&rft.issue=2&rft.jtitle=Astronomy+and+Astrophysics&rft.volume=499&rft_id=http%3A%2F%2Fcdsads.u-strasbg.fr%2Fcgi-bin%2Fnph-bib_query%3F2009A%2526A...499..515R%26db_key%3DAST%26nosetcookie%3D1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-Guandalini2010-3"><span class="mw-cite-backlink">↑ <a href="#cite_ref-Guandalini2010_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Guandalini2010_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><span id="CITAREFGuandalini,_R.2010" class="citation publicación">Guandalini, R. (2010). <a rel="nofollow" class="external text" href="http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2010A%26A...513A...4G&db_key=AST&nosetcookie=1">«Infrared photometry and evolution of mass-losing AGB stars. III. Mass loss rates of MS and S stars»</a>. <i><a href="/wiki/Astronomy_and_Astrophysics" title="Astronomy and Astrophysics">Astronomy and Astrophysics</a></i> <b>513</b>. <small>A4</small>.</span><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fes.wikipedia.org%3AWY+Cassiopeiae&rft.atitle=Infrared+photometry+and+evolution+of+mass-losing+AGB+stars.+III.+Mass+loss+rates+of+MS+and+S+stars&rft.au=Guandalini%2C+R.&rft.aulast=Guandalini%2C+R.&rft.date=2010&rft.genre=article&rft.jtitle=Astronomy+and+Astrophysics&rft.volume=513&rft_id=http%3A%2F%2Fcdsads.u-strasbg.fr%2Fcgi-bin%2Fnph-bib_query%3F2010A%2526A...513A...4G%26db_key%3DAST%26nosetcookie%3D1&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://vizier.u-strasbg.fr/viz-bin/VizieR-S?V*%20WY%20Cas">WY Cassiopeiae</a> (<a href="/wiki/General_Catalogue_of_Variable_Stars" title="General Catalogue of Variable Stars">General Catalogue of Variable Stars</a>)</span> </li> </ol></div> <style data-mw-deduplicate="TemplateStyles:r161257576">.mw-parser-output .mw-authority-control{margin-top:1.5em}.mw-parser-output .mw-authority-control .navbox table{margin:0}.mw-parser-output .mw-authority-control .navbox hr:last-child{display:none}.mw-parser-output .mw-authority-control .navbox+.mw-mf-linked-projects{display:none}.mw-parser-output .mw-authority-control .mw-mf-linked-projects{display:flex;padding:0.5em;border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral,#eaecf0);color:var(--color-base,#202122)}.mw-parser-output .mw-authority-control .mw-mf-linked-projects ul li{margin-bottom:0}.mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#a2a9b1);background-color:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output .mw-authority-control .navbox-list{border-color:#f8f9fa}.mw-parser-output .mw-authority-control .navbox th{background-color:#eeeeff}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .mw-mf-linked-projects{border:1px solid var(--border-color-base,#72777d);background-color:var(--background-color-neutral,#27292d);color:var(--color-base,#eaecf0)}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral-subtle,#202122)!important}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox-list{border-color:#202122!important}html.skin-theme-clientpref-night .mw-parser-output .mw-authority-control .navbox th{background-color:#27292d!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .mw-mf-linked-projects{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral,#27292d)!important;color:var(--color-base,#eaecf0)!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox{border:1px solid var(--border-color-base,#72777d)!important;background-color:var(--background-color-neutral-subtle,#202122)!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox-list{border-color:#202122!important}html.skin-theme-clientpref-os .mw-parser-output .mw-authority-control .navbox th{background-color:#27292d!important}}</style><div class="mw-authority-control"><div role="navigation" class="navbox" aria-label="Navbox" style="width: inherit;padding:3px"><table class="hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width: 12%; 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