Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..653s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 653-659. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astrophysics
12
Angular Momentum, Stellar Evolution, Stellar Mass Ejection, Supergiant Stars, Stellar Models, Stellar Rotation, Wolf-Rayet Stars
Scientific paper
Evolutionary sequences have been computed to central helium exhaustion for massive Population I star models with initial masses of 40, 60, 80, and 100 solar masses. A blue loop is found to be initiated in the red supergiant phase when either the hydrogen shell source (HSS) contacts the discontinuity in the hydrogen content left behind by the convective envelope, or when the combined action of the HSS and mass loss pinches the convective envelope out of existence. The former applies to cases of relatively low mass losss rates, and the latter to much higher mass loss rates. For intermediate rates, neither condition is met and there is no blue loop. If the hydrogen content at the surface is sufficiently small at central hydrogen exhaustion, a convective envelope cannot form and there is no red supergiant phase. Instead, the star evolves in the direction of the helium main sequence.
Ranga Sreenivasan S.
Wilson J. F. W.
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