The expected location of zero age horizontal branch stars

Details The expected location of zero age horizontal branch stars The expected location of zero age horizontal branch stars

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...33..169c&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 33, Aug. 1978, p. 169-179.

Astronomy and Astrophysics

Astrophysics

74

Position (Location), Stellar Evolution, Stellar Mass, Stellar Models, Chemical Composition, Globular Clusters, Graphs (Charts), Red Giant Stars, Stellar Luminosity, Stellar Temperature, Tables (Data)

Scientific paper

Zero-age horizontal-branch loci have been computed taking into account evolutionary indications on core masses at the helium flash and the increase of helium content in the envelope of red giants. As a result, ZAHB loci have been obtained as function of the initial chemical composition only, assuming a cluster age of 10 billion years. Six values of metal content (Z equals 0.00001, 0.00001, 0.0004, 0.001, 0.004, and 0.01) and four values for the original helium abundance (Y equals 0.10, 0.20, 0.30, and 0.40) have been considered. The computed models almost reach the helium main sequence.

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