Abstract
Investigations in recent years have shown that there may be two mechanisms which place stars in the W Virginis instability region (Kraft, 1972). The variables with periods less than 8 days seem to be in the stage of ‘above horizontal branch’ evolution discussed by Strom et al. (1970). The longer period group apparently results when thermal instabilities in the helium burning shell of an asymptotic red giant branch star cause it to loop to the left in the HR diagram. This longer period group has been investigated by Schwarzschild and Härm (1970) and Mengel (1972). The present study has been undertaken to see if there are any notable differences between the period changes of variables belonging to the two groups.
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© 1973 D. Reidel Publishing Company, Dordrecht, Holland
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Coutts, C.M. (1973). A Preliminary Investigation of Period Changes for W Virginis Stars in Globular Clusters. In: Fernie, J.D. (eds) Variable Stars in Globular Clusters and in Related Systems. Astrophysics and Space Science Library, vol 36. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2590-4_21
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DOI: https://doi.org/10.1007/978-94-010-2590-4_21
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