Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..204c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. 204-212.
Astronomy and Astrophysics
Astrophysics
109
Helium, Horizontal Branch Stars, Stellar Cores, Stellar Evolution, Abundance, Convection, Stellar Luminosity, Stellar Models
Scientific paper
The result of an investigation into the evolutionary characteristics of a typical horizontal-branch (HB) model are presented. A new treatment of semiconvection has been used which overlaps Robertson and Faulkner's prescription in the major phase of central He burning and which allows a meaningful treatment of the last phases of He exhaustion at the center. The occurrence of convective instabilities near the He exhaustion in the central core is confirmed, finding that three major convection pulses occur before the exhaustion of He. Consequences regarding HB lifetimes and post-HB evolution are briefly discussed.
Castellani Vittorio
Chieffi Alessandro
Pulone Luigi
Tornambe' Amedeo
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