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Title:
The Oosterhoff period groups and the age of globular clusters. I Photometry of cluster variables in M15
Authors:
Sandage, A.; Katem, B.; Sandage, M.
Affiliation:
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AC(Mount Wilson and Las Campanas Observatoires, Pasadena, CA)
Publication:
Astrophysical Journal Supplement Series, vol. 46, May 1981, p. 41-74. (ApJS Homepage)
Publication Date:
05/1981
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Globular Clusters, Stellar Evolution, Stellar Spectrophotometry, Variable Stars, Color, Helium, Horizontal Branch Stars, Light Curve, Main Sequence Stars, Metallic Stars, Stellar Luminosity, Tables (Data)
DOI:
10.1086/190734
Bibliographic Code:
1981ApJS...46...41S

Abstract

Three-color photometry is used to study distributions of color, amplitudes, light-curve shapes, and periods within the instability strip of 60 RR Lyrae stars in M15. Period-amplitude, period-rise time, period-color, and color-amplitude relations are compared with data for M3, and correlations of parameters involving period are shifted by delta log P = 0.055 to longer periods in M15. An M15 horizontal branch brighter than that in M3 by delta log L(HB) = 0.090 is found to be the only explanation consistent with the Ritter condition. The abundance is shown to differ between the clusters by delta Y(M15 minus M3) = +0.05 + or - 0.02 using zero-age horizontal branch models, and the ages of M3 and M15 are shown the same within 0.5 sigma of the combined error. The mean age is found using Iben-Rood and Yale models, and HB luminosity and metallicity is found to be the same as required for main-sequence turnoff luminosity for two clusters of same age and different metallicities.

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