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Oxygen-enhanced models for globular cluster stars. III - Horizontal-branch sequencesA 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.
Document ID
19920061813
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dorman, Ben
(Victoria, University Canada; Virginia, University, Charlottesville, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1992
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 81
Issue: 1 Ju
ISSN: 0067-0049
Subject Category
Astrophysics
Accession Number
92A44437
Funding Number(s)
CONTRACT_GRANT: NAGW-1004
CONTRACT_GRANT: NAGW-2596
Distribution Limits
Public
Copyright
Other

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