Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work...89m&link_type=abstract
IN: ESO Workshop on Primordial Helium, Garching, West Germany, February 2, 3, 1983, Proceedings (A83-50030 24-90). Garching, Wes
Physics
12
Galactic Evolution, Helium, Nuclear Fusion, Stellar Evolution, Chemical Evolution, Heavy Elements, Milky Way Galaxy, Stellar Mass Ejection, Stellar Winds
Scientific paper
The processing of helium in massive stars is examined in order to obtain a value of the ratio of helium to metal enrichment during galactic evolution. The difficulties of the standard treatment of helium processing are summarized, and the evolution of a massive star is followed in order to obtain the exact amounts of helium and heavy elements processed. The contribution of stellar winds and changing central conditions are emphasized. The amounts of helium and heavy elements produced in massive stars are determined and combined with those produced by lighter stars. These total stellar yields are then weighted by the initial mass function and quantities relevant to the chemical evolution of galaxies are derived. A ratio of helium to metal enrichment in the Galaxy on the order of unity is obtained.
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