Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..447b&link_type=abstract
Astrophysical Journal, Supplement Series, vol. 49, July 1982, p. 447-468.
Astronomy and Astrophysics
Astrophysics
121
Stellar Evolution, Stellar Luminosity, Stellar Mass Ejection, Stellar Models, Stellar Structure, Supergiant Stars, Abundance, Cepheid Variables, Chemical Composition, Stellar Temperature, Tables (Data)
Scientific paper
The evolution of 15, 30, and 40 solar-mass stars with compositions Y = 0.28 and Z = 0.01, 0.001, and 0.0002, and of 50 solar-mass stars with Y = 0.28 and Z = 0.0002 was investigated. These models were evolved from the zero-age main sequence through core helium burning and up to the point of carbon ignition. All models were evolved with and without inclusion of mass loss. It is shown that all massive stars ignite helium as blue supergiants. Stars with initial masses of about 30 solar masses evolve redward very slowly and spend less than 1% of their total lifetimes as red supergiants. Above 30 solar masses, the rate of redward evolution increases dramatically. The effect of a reduction in the initial metal content relative to solar abundances is to cause the models to be bluer and, in general, slightly more luminous at comparable stages of evolution.
Brunish Wendee M.
Truran Jame. W.
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