Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..140c&link_type=abstract
Astronomy and Astrophysics, vol. 105, no. 1, Jan. 1982, p. 140-148. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
29
Chemical Evolution, Galactic Evolution, Heavy Elements, Helium, Stellar Evolution, Stellar Mass Ejection, Abundance, Astronomical Models, Mass Ratios, Sun
Scientific paper
The effects of mass loss by stellar wind in stars of more than one solar mass, and of different choices for the initial mass function on the helium-to-heavy element enrichment ratio, are studied on the way to the proposal of a model for the solar vicinity's chemical evolution which obeys all major observational constraints while taking account of star mass outflow and the dependence of the mass function on the gas metallicity. It is found that a Saltpeter-like mass function cannot be safely used to reproduce the observed Delta Y/Delta Z ratios unless massive star mass loss at substantial rates is invoked, since this function equally weighs both helium and metal producers. In such a case the ratio is easily matched but the observed young star metallicity and gas cannot be reproduced. It is concluded that present stellar and galactic evolution data can explain the observed Delta Y/Delta Z ratio.
Chiosi Cesare
Matteucci F. M.
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