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Revised Empirical Formulae for the Absolute Magnitudes and Intrinsic Colors of RRab Stars

Published online by Cambridge University Press:  12 April 2016

A. R. Walker  and
G. Kovács
A. R. Walker
Affiliation:
Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, Casilla 603, La Serena, Chile
G. Kovács
Affiliation:
Konkoly Observatory, P.O. Box 67, H-1525, Budapest, Hungary

Abstract

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The relations between the physical parameters of the RRab stars and the Fourier parameters of their light curves have been reanalyzed on the basis of new CCD data. We show that the absolute magnitude MV and the dereddened color indices (B − V)0, (V − I)0 are linear functions of the period and of the A1 Fourier amplitude of the V light curve. Due to the large datasets, we are able to test the consistency of the formulae on independent sets. The present results are in good or fair agreement with our previous studies, despite the fewer number of significant parameters entering in the revised formulae.

Type
Part 3. Cepheids, RR Lyrae Stars, Distance Scales
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 268
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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