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Title:
Evolutionary sequences for horizontal branch stars
Authors:
Sweigart, Allen V.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 65, Sept. 1987, p. 95-135. (ApJS Homepage)
Publication Date:
09/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Globular Clusters, Horizontal Branch Stars, Stellar Evolution, Heavy Elements, Helium, Stellar Composition, Stellar Luminosity, Stellar Temperature
DOI:
10.1086/191219
Bibliographic Code:
1987ApJS...65...95S

Abstract

A new grid of canonical evolutionary horizontal branch (HB) sequences is presented. Sequences are computed for each combination of the following helium and heavy-element abundances, respectively: Y(main sequence) = 0.20, 0.25, 0.30, and Z = 0.0001, 0.001, and 0.01. The results show that the bifurcation point at which the HB morphology changes from redward-evolving tracks to tracks with blueward loops shifts to higher effective temperatures with increasing helium abundance or metallicity. The sequences can be used to study in more detail how a number of HB properties such as the HB lifetime, the effective temperature at the bifurcation point in the track morphology, the luminosity dropoff of the blue HB, and the luminosity width of the red HB depend on the composition.

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