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Title:
Oxygen-enhanced models for globular cluster stars. III - Horizontal-branch sequences
Authors:
Dorman, Ben
Affiliation:
AA(Victoria, University, Canada; Virginia, University, Charlottesville)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 81, no. 1, July 1992, p. 221-250. Research supported by NSERC. (ApJS Homepage)
Publication Date:
07/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GLOBULAR CLUSTERS, OXYGEN, STELLAR EVOLUTION, STELLAR MODELS, ASYMPTOTIC GIANT BRANCH STARS, COLOR-MAGNITUDE DIAGRAM, STELLAR COMPOSITION, STELLAR CORES, STELLAR LUMINOSITY
DOI:
10.1086/191691
Bibliographic Code:
1992ApJS...81..221D

Abstract

A large grid of horizontal-branch (HB) evolutionary sequences which have been calculated with core expansion and semiconvection and with enhanced oxygen composition are presented and described. Tracks for 10 different metallicities are computed; they range from (Fe/H) = -0.47 to -2.26 and comprise a total of 115 sequences. The evolution is traced from the zero-age horizontal-branch (ZAHB) to the lower AGB at a point where log L/solar luminosity = 2.25. All of the sequences are illustrated on both the theoretical H-R diagram and on the B, V color-magnitude diagram. A complete set of tables for the ZAHB models and a representative sample of tabulations of the track parameters are provided. The phenomena which control HB evolution morphology, and existing certainties in theoretical HB models are discussed.

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