On partial mixing zones in horizontal-branch stellar cores

Details On partial mixing zones in horizontal-branch stellar cores On partial mixing zones in horizontal-branch stellar cores

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..387d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 387-403.

Astronomy and Astrophysics

Astrophysics

33

Convection-Diffusion Equation, Giant Stars, Horizontal Branch Stars, Stellar Cores, Stellar Evolution, Stellar Interiors, Asymptotic Giant Branch Stars, Mixing, Stellar Models, Temperature Gradients, Thermodynamic Equilibrium

Scientific paper

The present semianalytical treatment for aspects of horizontal branch (HB) star core evolution considers a criterion for the existence of a partial mixing zone in a general stellar model. This criterion implies that there must be a zone with a composition gradient. Attention is given to the consequences of the assumption for the behavior of the core close to the central He exhaustion; with the degree of mixing implied by the constraint on the temperature gradient, core opacity tends to a limit late in evolution, and then declines. The central opacity and flux decreases give the convective region a strong tendency to shrink.

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