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W Virginis variables are a subclass of
"The Cepheids of Population II and Related Stars"
''Publications of the Astronomical Society of the Pacific'', 114 p.689–699 (2002) and are of spectral class F6 – K2.W. Strohmeier, ''Variable Stars'', Pergamon (1972)Soszyński, I.; Udalski, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Wyrzykowski, Ł.; Szewczyk, O.; Ulaczyk, K.; Poleski, R
"The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II.Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud"
''Acta A.'', vol 58 (2008) They were first recognized as being distinct from classical Cepheids by Walter Baade in 1942, in a study of Cepheids in the Andromeda Galaxy that proposed that stars in that galaxy were of two populations.Webb, Stephen, ''Measuring the Universe: The Cosmological Distance Ladder'', Springer, (1999)
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W Virginis variables are a subclass of Type II Cepheid
Type II Cepheids are variable stars which pulsate with periods typically between 1 and 50 days. They are population II stars: old, typically metal-poor, low mass objects.
Like all Cepheid variables, Type IIs exhibit a relationship between the st ...
s which exhibit pulsation periods between 10–20 days,Wallerstein, G."The Cepheids of Population II and Related Stars"
''Publications of the Astronomical Society of the Pacific'', 114 p.689–699 (2002) and are of spectral class F6 – K2.W. Strohmeier, ''Variable Stars'', Pergamon (1972)Soszyński, I.; Udalski, A.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Wyrzykowski, Ł.; Szewczyk, O.; Ulaczyk, K.; Poleski, R
"The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II.Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud"
''Acta A.'', vol 58 (2008) They were first recognized as being distinct from classical Cepheids by Walter Baade in 1942, in a study of Cepheids in the Andromeda Galaxy that proposed that stars in that galaxy were of two populations.Webb, Stephen, ''Measuring the Universe: The Cosmological Distance Ladder'', Springer, (1999)
See also
* Low-dimensional chaos in stellar pulsationsReferences
External links
* AAVSO Variable Star of the Month. W Virginis: Spring 200HTML
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