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Title:
Rate of Period Change as a Diagnostic of Cepheid Properties
Authors:
Turner, David G.; Abdel-Sabour Abdel-Latif, Mohamed; Berdnikov, Leonid N.
Affiliation:
AA(Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3, Canada ), AB(Department of Astronomy and Astrophysics, National Research Institute of Astronomy and Geophysics, Helwan, Cairo 11242, Egypt ), AC(Sternberg Astronomical Institute and Isaac Newton Institute of Chile, Moscow Branch, 13 Universitetskij Prospekt, Moscow 119899, Russia )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 118, Issue 841, pp. 410-418. (PASP Homepage)
Publication Date:
03/2006
Origin:
UCP
Astronomy Keywords:
Stars: Variables: Cepheids, Stars: Evolution
DOI:
10.1086/499501
Bibliographic Code:
2006PASP..118..410T

Abstract

The rate of period change P˙ for a Cepheid is shown to be a parameter that is capable of indicating the instability-strip crossing mode for individual objects and, in conjunction with light amplitude, the likely location of the object within the instability strip. The observed rates of period change in over 200 Milky Way Cepheids are demonstrated to be in general agreement with predictions from stellar evolutionary models, although the sample also displays features that are inconsistent with some published models and indicative of the importance of additional factors not fully incorporated in models to date.
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