Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..291b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 291-299. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
4
Main Sequence Stars, Stellar Evolution, Stellar Mass Ejection, Astronomical Models, Giant Stars, Numerical Integration, Stellar Luminosity, Supermassive Stars
Scientific paper
The width of the main sequence of massive stars is investigated by using a composite n1 = n2 = 3 polytropic model with a composition discontinuity between the core and envelope to represent massive stars. The general properties of composite n1 = n2 = n polytropes are first discussed. Numerical integrations for n = 3 give the ratio of the radii at end and beginning of the main sequence which, together with the change in luminosity, determines the width of the main sequence. Mass loss and overshooting are taken into account within the context of the model. The model with a step discontinuity is then generalized to include a zone of variable mean molecular weight, and the effects of mass loss and overshooting are illustrated. The results of evolutionary calculations with mass loss and overshooting are discussed and compared with the results of composite polytropic models.
Beech Martin
Mitalas R.
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