Isochrones for H-burning globular cluster stars. II - The metallicity range Fe/H = -2.3 to -0.5

Details Isochrones for H-burning globular cluster stars. II - The metallicity range Fe/H = -2.3 to -0.5 Isochrones for H-burning globular cluster stars. II - The metallicity range Fe/H = -2.3 to -0.5

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..525s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, June 1991, p. 525-616.

Other

119

Galactic Clusters, Globular Clusters, Stellar Composition, Stellar Evolution, Subdwarf Stars, Metallicity, Star Clusters, Stellar Interiors, Tables (Data)

Scientific paper

A set of theoretical isochrones ranging between 10 and 20 Gyr and between Z = -40,000 and Z = -6000 is presented. All the isochrones fully extend from the lower main sequence up to the He flash. Presented isochrones turn out to be similar in shape to those described in literature but systematically redder by few hundredths of a magnitude. The set differs profoundly from the Revised Yale Isochrones. A fit to a selected group of Galactic globular clusters including M92, M68, M30, NGC 6752, M10, M3, M5, NGC 362, 47 Tucanae, and Palomar 12 is also presented. It is found that eight of the eleven clusters show an age spread not exceeding 3 Gyr. The most metal-rich clusters NGC 362, 47 Tuc, and Palomar 12 turn out to be significantly younger by approximately 5 Gyr compared with the others. The metallicities inferred for these clusters fairly agree with the Zinn and West metallicity scale. The absolute visual magnitude of the horizontal branches of the clusters is determined as a function of the metallicity.

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