Other
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...77..299c&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 77, Oct. 1991, p. 299-316.
Other
28
Massive Stars, Stellar Cores, Stellar Evolution, Stellar Models, Hertzsprung-Russell Diagram, Stellar Composition, Stellar Mass
Scientific paper
Stellar evolution with parameterized overshooting from the convective core has been studied for the stellar mass range M/M(solar) = 3-30 and for the initial chemical composition range Xe = 0.650-0.739 (hydrogen) and Ze = 0.021-0.044 (metals). Evolutionary sequences run from the zero-age main sequence to the end of core helium burning, but emphasis is placed here on the core helium-burning phase. Convective core overshooting during the previous main-sequence phase leads, in most cases, to a shortening of the blue loop on the H-R diagram that forms when helium is being depleted in the core. On the other hand, convective overshooting from the helium-burning core has the opposite effect. A larger initial metals abundance also tends to shorten the blue loop. In an extreme case the blue loop can be fully suppressed, but in a marginal case the normal trend can be reversed.
Chin Chao-Wen
Stothers Richard B.
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