Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374..631f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 20, 1991, p. 631-646. Research supported by Pennsylvania State Un
Astronomy and Astrophysics
Astrophysics
18
Late Stars, Stellar Envelopes, Stellar Evolution, Stellar Interiors, Stellar Mass, Thermodynamic Equilibrium, Abundance, Helium, Stellar Cores, Stellar Gravitation, Stellar Models
Scientific paper
The paper is concerned with the structure of shell helium-burning stars with a carbon-oxygen core of relatively small mass. The analysis assumes thermal equilibrium, and model properties are presented in relation to the core mass and total model mass. Upper and lower limits on the mass fraction of the core are obtained; the variation of the envelope structure with the core configuration is discussed. Based on the results obtained, it is shown that the red giant structure is attributable to the power-law distribution of density, which is forced when envelope matter is of sufficiently high entropy that self-gravity can be ignored relative to the gravity produced by the inner core over a distance many time larger than the core radius.
Fujimoto Masayuki Y.
Iben Icko Jr.
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