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Title:
Using Cepheid Period Changes to Test Stellar Evolutionary Models
Authors:
Turner, David; Abdel-Sabour Abdel-Latif, Mohamed; Berdnikov, Leonid N.
Publication:
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.144
Publication Date:
08/2005
Origin:
JRASC
Bibliographic Code:
2005JRASC..99R.144T

Abstract

Rate of period change in Cepheid variables is a parameter that can be predicted from stellar evolutionary models, provided the instability strip-crossing mode is known. Different evolutionary models predict different rates of period change for the same strip crossing, which suggests that observed rates of period change in Cepheids are useful for testing how well different models match real stars. From a compilation of observed period changes in about 200 Cepheids that we have completed in recent years, we examine how closely the observational data match model predictions. In general, the observations are consistent with model predictions, yet there are a number of distinct differences indicating a need for further refinements to existing stellar evolutionary models. In addition, rate of period change for Cepheids is a parameter that may be useful for establishing the location of individual Cepheids within the instability strip, independent of interstellar extinction.

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