Other
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..25t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 1, 1987, p. L25-L28.
Other
19
Elliptical Galaxies, Milky Way Galaxy, Stellar Evolution, Stellar Luminosity, Supernovae, Binary Stars, Dwarf Stars, Galactic Evolution, Stellar Models
Scientific paper
The rate of subluminous Type I SNs (Type Ib) is computed by means of galactic evolutionary models and compared with that of classical Type I SNs (Type Ia) in the Galaxy and in ellipticals. The assumed progenitors for Type Ib SNs are binary systems consisting of a C-O degenerate dwarf plus a nondegenerate He star, whereas those for Type Ia are binary systems made of two C-O degenerate dwarfs. The present time rate of Type Ib SNs in the solar neighborhood is predicted to be almost identical to the present time rate of Type Ia, in agreement with the observational estimates. Furthermore, it is shown that the Type Ib SN rate in ellipticals goes to zero at about 10 to the 9th yr after galaxy formation time, after undergoing a very sharp peak at around 0.05 x 10 to the 9th yr. On the other hand, Type Ia SN explosions continue to occur until the present time, in agreement with the observations. It is concluded that the agreement between the predicted Type Ib SN rate and the observational constraints supports the choice made for the progenitors of such SNs, although other possible progenitors for Type I SNs cannot be excluded.
Matteucci Francesca
Tornambe' Amedeo
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