Editing W Virginis variable

[[File:Kappa Pavonis TESS lightcurve.png|thumb|Lightcurve of the W Virginis (Type II Cepheid) variable κ Pavonis recorded by NASA's Transiting Exoplanet Survey Satellite (TESS).]]
'''W Virginis variables''' are a subclass of [[Type II Cepheid]]s which exhibit pulsation periods between 10–20 days,<ref name=wallerstein2002>{{cite journal | last=Wallerstein | first=G. | author-link=George Wallerstein | bibcode=2002PASP..114..689W | title=The Cepheids of Population II and Related Stars | journal=Publications of the Astronomical Society of the Pacific | volume=114 | pages=689–699 | year=2002 | issue=797 | doi=10.1086/341698 }}</ref> and are of [[spectral classification|spectral class]] F6 – K2.<ref name="strohmeier1972">{{cite book | first=W. | last=Strohmeier | title=Variable Stars | publisher=Pergamon Press | year=1972 | bibcode=1972vast.book.....S | location=Oxford, New York }}</ref><ref name=so08>{{cite journal | last1=Soszyński | first1=I. | last2=Udalski | first2=A. | last3=Szymański | first3=M. K. | last4=Kubiak | first4=M. | last5=Pietrzyński | first5=G. | last6=Wyrzykowski | first6=Ł. | last7=Szewczyk | first7=O. | last8=Ulaczyk | first8=K. | last9=Poleski | first9=R. | bibcode=2008AcA....58..293S | title=The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II.Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud | journal=  Acta Astronomica| volume=58 | year=2008 | page=293 | arxiv=0811.3636 }}</ref>

They were first recognized as being distinct from classical Cepheids by [[Wilhelm Heinrich Walter Baade|Walter Baade]] in 1942, in a study of Cepheids in the [[Andromeda Galaxy]] that proposed that stars in that galaxy were of two populations.<ref name="webb1999">{{cite book | last=Webb | first=Stephen | title=Measuring the Universe: The Cosmological Distance Ladder | publisher=Springer | year=1999 }}</ref>

==See also==
*[[Low-dimensional chaos in stellar pulsations]]

==References==
{{Reflist}}

==External links==
* AAVSO Variable Star of the Month. W Virginis: Spring 2003 [http://www.aavso.org/sites/default/files/vsots/spring03.pdf PDF] / [http://www.aavso.org/vsots_wvir HTML]
* [http://ogle.astrouw.edu.pl/atlas/W_Vir.html OGLE Atlas of Variable Star Light Curves - W Virginis stars]

{{Variable star topics}}

{{DEFAULTSORT:W Virginis Variable}}
[[Category:W Virginis variables| ]]


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