Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..155b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 155-168.
Astronomy and Astrophysics
Astrophysics
97
Abundance, Globular Clusters, Hertzsprung-Russell Diagram, Magellanic Clouds, Stellar Evolution, Cepheid Variables, Interstellar Extinction, Stellar Color, Stellar Magnitude
Scientific paper
A scheme for constructing synthetic H-R diagrams as a function of cluster age, metallicity, and He abundance from a three-dimensional grid of theoretical evolutionary tracks in Y, Z, and mass is outlined. This scheme is then applied to fit observed color-magnitude data for the LMC star cluster NGC 1866. This comparison between theory and observation provides both a sensitive test of the stellar evolution models and a means to determine the age and composition of the cluster. The best fit to the cluster data is for a composition of (Y, Z) = (0.273 + or - 0.010, 0.0160 + or - 0.0008) and an age of 86 + or - 5 x 10 to the 6th yr, with an intrinsic dispersion in age of less than 5 x 10 to the 6th yr. The population of Cepheids is also computed. Sources of uncertainty in the data and theory are discussed, and the possible importance of nonlocal convection processes is highlighted.
Becker S. A.
Mathews Grant J.
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