Abstract
The discrepancies between observed and theoretically calculated period ratios of the double mode, classical Cepheids and other groups of Cepheid type variables have played a prominent role in investigations of the important physical characteristics of these stars during the last twenty years. Today, there is growing consensus that the drastic increases in astrophysical opacities proposed by Simon (1982) provide the correct solution of all the period ratio problems (e.g. Petersen, 1989; Iglesias and Rogers, 1992; Moskalik et al., 1991).
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References
Andreasen, G. K.: 1988, Astronomy and Astrophysics 201, 72.
Iglesias, C. A. and Rogers, F. J.: 1992, preprint.
Moskalik, P., Buchler, J. R. and Marom, A.: 1991, preprint.
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Simon, N. R.: 1982, Astrophysical Journal, Letters to the Editor 260, L87.
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© 1993 Springer Science+Business Media Dordrecht
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Petersen, J.O. (1993). Understanding Changes in Period Ratios. In: Takeuti, M., Buchler, JR. (eds) Nonlinear Phenomena in Stellar Variability. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1062-4_19
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DOI: https://doi.org/10.1007/978-94-011-1062-4_19
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