Statistics – Computation
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...73..709l&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 73, Aug. 1990, p. 709-746.
Statistics
Computation
89
Globular Clusters, Horizontal Branch Stars, Stellar Cores, Stellar Evolution, Tables (Data), Astronomical Models, Blue Stars, Hertzsprung-Russell Diagram, Star Distribution, Stellar Luminosity, Variable Stars
Scientific paper
A new grid of standard (i.e., solar CNO/Fe, no core rotation, and including semiconvection) horizontal-branch evolutionary sequences are presented which extend the grid of Sweigart both by including the final phase of core helium exhaustion and by using a finer grid of compositions. These sequences were constructed specifically for the studies of the Sandage period-shift effect and the second parameter phenomenon among the Galactic globular clusters. The numerical results for the observable characteristics of the sequences are tabulated which can be directly used to synthesize the observed horizontal-branch distributions. The present computations suggest that the observed difference in period change of RR Lyrae stars in the globular clusters M3 and M15 could be attributed, at least in the mean, to stellar evolution.
Demarque Pierre
Lee Young-Wook
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