Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66..975s&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Sept.-Oct. 1989, p. 975-982. In Russian.
Astronomy and Astrophysics
Astronomy
4
Hertzsprung-Russell Diagram, Stellar Evolution, Wolf-Rayet Stars, Stellar Composition, Stellar Envelopes, Stellar Mass, Stellar Temperature
Scientific paper
The observed star distribution in the upper part of the Hertzsprung-Russell diagram can be explained if the evolution of stars of about 64 solar masses is accompanied by mixing of matter in the semiconvective zone and loss of mass at observed rates, and stars of about 128 solar masses have a stage in which matter is lost at the rate of about 0.01 solar mass per year. The theoretical estimate of the fraction of stars of WR type agrees with observation if the mass loss rate comes to equal the rate typical of WR stars when the hydrogen content in the stellar envelope is decreased to about 40 percent by mass.
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