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Population i pulsating stars

VII. Approximate Period-Luminosity Relations

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Abstract

Six ways for obtaining approximate period-luminosity (P-L) relations for classical cepheids and Delta Scuti variables are presented. Three out of these ways were earlier schematically considered by J.P. Cox (1980, 1985). It was proceeded from certain results derived from the study of stellar pulsation and evolution, by using some simple considerations and simplifying assumptions. The expressions obtained for the coefficients of these approximate P-L relations, were used to estimate the slopes and the zero-points. In addition, it was evaluated the influence of both different modes of radial pulsations and variations of Population I chemical composition on the zero-points. The results satisfactorily agree with those derived from observations or accurate theoretical calculations.

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  1. Department of Astronomy, University of Sofia, Sofia, Bulgaria

    Ts. G. Tsvetkov

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  1. Ts. G. Tsvetkov
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Tsvetkov, T.G. Population i pulsating stars. Astrophys Space Sci 203, 289–303 (1993). https://doi.org/10.1007/BF00658997

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