W Virginis variable explained

W Virginis variables are a subclass of Type II Cepheids which exhibit pulsation periods between 10–20 days,^[1] and are of spectral class F6 – K2.^{[2] [3]}

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.^[4]

See also

• Low-dimensional chaos in stellar pulsations

External links

• AAVSO Variable Star of the Month. W Virginis: Spring 2003 PDF / HTML
• OGLE Atlas of Variable Star Light Curves - W Virginis stars

Notes and References

1. Wallerstein . G. . George Wallerstein . 2002PASP..114..689W . The Cepheids of Population II and Related Stars . Publications of the Astronomical Society of the Pacific . 114 . 689–699 . 2002 . 797 . 10.1086/341698 .
2. Book: Strohmeier, W. . Variable Stars . Pergamon Press . 1972 . 1972vast.book.....S . Oxford, New York .
3. Soszyński . I. . Udalski . A. . Szymański . M. K. . Kubiak . M. . Pietrzyński . G. . Wyrzykowski . Ł. . Szewczyk . O. . Ulaczyk . K. . Poleski . R. . 2008AcA....58..293S . 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 Astronomica. 58 . 2008 . 293 . 0811.3636 .
4. Book: Webb, Stephen . Measuring the Universe: The Cosmological Distance Ladder . Springer . 1999 .