Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..196r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 196-214.
Astronomy and Astrophysics
Astrophysics
34
Globular Clusters, Stellar Composition, Stellar Evolution, Stellar Luminosity, Stellar Models, Milky Way Galaxy, Red Giant Stars, Stellar Envelopes, Stellar Interiors, Stellar Structure
Scientific paper
Using recently calculated tables (Los Alamos) of radiative opacities and the latest thermonuclear reaction rates, stellar evolutionary tracks for low-mass (0.4 - 1.2 M_sun;) Population II stars (0.0001 ≤ Z ≤ 0.01) have been calculated for two helium abundances, Y = 0.2 and 0.3. Luminosity functions (LFs) for ages 8 Gyr ≤ t ≤ 20 Gyr have been constructed from these tracks, and the resultant dependence of LF morphologies on age and chemical composition has been studied. The observed M13 LF has been compared to these theortical LFs. Assuming a distance modulus of (m-M)0= 14.3, a metallicity-independent lower bound of 14 Gyr can be placed on the age of M13.
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