Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sva....19..142v&link_type=abstract
(Astronomicheskii Zhurnal, vol. 52, Mar.-Apr. 1975, p. 227-233.) Soviet Astronomy, vol. 19, no. 2, 1975, p. 142-145. Translatio
Astronomy and Astrophysics
Astronomy
3
Nuclear Fusion, Stellar Evolution, Stellar Structure, Supergiant Stars, Chemical Composition, Early Stars, Main Sequence Stars, Neutrinos, Stellar Envelopes, Stellar Mass
Scientific paper
The structure and evolution of stars with masses of 16, 32, and 64 solar masses and a specific initial chemical composition are examined from zero-age on the main sequence to total oxygen depletion in the core of a red supergiant. The evolutionary track of a star is shown to be determined by equilibrium in the zone of variable chemical composition at the stage of core helium-burning and by energy losses due to neutrino emission at later stages. It is found that without neutrino emission, the outer convective zone will penetrate into the source regions of the previous hydrogen and helium layers, which may lead to significant anomalies in the chemical composition at the stellar surface and to a reduction in the mass of the carbon-oxygen core. The content of helium, oxygen, and carbon in the interstellar medium due to the evolution of massive stars is estimated for the lifetime of the galaxy, and some consequences are examined for stellar rotation and meridional circulation.
Tutukov Aleksandr V.
Varshavskii V. I.
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