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The vertical height of the horizontal branch - The range in the absolute magnitudes of RR Lyrae stars in a given globular cluster
Sandage, Allan
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 603-630. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Cepheid Variables, Globular Clusters, Horizontal Branch Stars, Stellar Magnitude, Color-Magnitude Diagram, Metallicity, Stellar Luminosity, Stellar Models, Stellar Temperature
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Evolution away from the zero-age horizontal branch is presently identified as the basis of the observed range of apparent magnitudes of RR Lyrae variables in a given cluster, on the basis of data for periods, temperatures, and magnitudes of cluster variables in numerous pertinent galaxies. It is shown that, in a given cluster, the RR Lyrae stars that are brighter than others of the same color are those which have longer periods by factors that would be expected, on the basis of the larger radii calculated by proceeding on the assumption that the brighter observed luminosities are real.

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