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RR lyrae variables and stellar evolution in M 15

Published online by Cambridge University Press:  04 August 2017

K. Barlai
K. Barlai*
Affiliation:
Konkoly Observatory, Budapest

Abstract

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The O-C curves — widely used for investigating the period behaviour of variable stars — are generally constructed under the assumption that the period changes are linear in time. If it is indeed so, the main trend of the diagram should outline a positive or negative parabola and β values are determined to characterize the curvature of the parabolae, i.e. the rate of change of the period. This rate, however, even in the case of ω Cen does not indicate exact parabola (Belserene, 1973).

Type
III. BINARITY, PULSATION, ROTATION AND MIXING
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 457 - 460
Copyright
Copyright © Reidel 1984 

References

Barlai, K.: 1984, Comm. Konkoly Obs., Budapest, No. 85 (in press) Google Scholar
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Smith, H.A. and Sandage, A.: 1981, Astron. J. 86, pp. 1870–1881 CrossRefGoogle Scholar
Sweigart, A.V. and Renzini, A.: 1979, Astron. Astrophys. 71, pp. 66–78 Google Scholar
Szeidl, B.: 1975, in Variable Stars and Stellar Evolution, IAU Symp. 67, eds. Sherwood, V.E., Plaut, L., D. Reidel, Dordrecht, pp. 545–552 CrossRefGoogle Scholar