Statistics – Computation
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.210..153p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 210, no. 1-2, p. 153-155 (IAU Colloquium 134)
Statistics
Computation
1
Cepheid Variables, Opacity, Stellar Models, Stellar Oscillations, Computational Astrophysics, Period Doubling, Stellar Evolution
Scientific paper
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. It seems as first strange that the optimal opacity change can produce both the decrease in period ratio for double mode classical Cepheids and the increased period ratio in models of delta Scuti stars. Here we used kappa-effect-functions to provide both a detailed description of the effects of opacity changes and an improved and more direct understanding of these effects.
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