Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1159s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, Aug. 1983, p. 1159-1165.
Astronomy and Astrophysics
Astronomy
44
Globular Clusters, Stellar Evolution, Main Sequence Stars, Metallicity, Stellar Luminosity, Stellar Magnitude, Subdwarf Stars, Variable Stars
Scientific paper
Cluster ages of 18 + or - 2 billion years are derived for M92 and M15 on the basis of a comparison of Vandenberg's (1983) globular cluster isochrones with the photometry of many of the clusters' main sequence stars, using a vertical fit for the turn-off luminosity together with distance moduli derived from the period-color-luminosity relation of their RR Lyrae stars. The systematics of the composite CM diagram for clusters of different metallicity are compared with those predicted on the basis of Vandenberg's isochrones, for the case of 18 billion years, and good agreement is obtained. The adopted zero-point value of + 0.63 is justified through a comparison of the main sequences of M92, M3, and M5 with that defined by 11 field subdwarfs whose metallicities lie in the Fe/H ratio range of -2.2 and -1.2, for which suitable astrometric distances exist.
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