Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..447t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 2, Oct. 1985, p. 447-451.
Astronomy and Astrophysics
Astrophysics
6
Chemical Evolution, Galactic Evolution, Stellar Evolution, Stellar Mass, Supernovae, Binary Stars, Metallicity
Scientific paper
The effects of recent stellar evolution research results on the theory of the final fate of intermediate mass stars, both single and in binary systems, and on the theory of galactic chemical evolution are discussed. An estimate of the current type II SN rate, taking into account a new mass range for e-capture SNe, turns out to be higher by a factor of two with respect to that observed. Better agreement is reached when the upper mass limit M(up) of core-bounce SNe is assumed to be 50 solar masses. Taking both M(up) and the rate of mass loss as functions of metallicity, type I 1/2 SNe (if any) should have progenitors only in the very metal-poor stellar generations, so that their effect on galactic chemical enrichment is negligible. The formation frequency of type I SNe at various metallicities is computed and found to be a descreasing function of time.
Matteucci Francesca
Tornambe' Amedeo
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