The frequency of SN IA in galaxies of different Hubble type

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Elliptical Galaxies, Hubble Constant, Stellar Luminosity, Supernovae, White Dwarf Stars, Astronomical Catalogs, Galactic Evolution, Galactic Structure

Scientific paper

The frequency of supernovae of type Ia per unit infrared luminosity is found to be an order of magnitude higher in late-type spirals than it is in early-type galaxies. Presently available data also suggest, but do not yet prove, that the SN Ia rate in amorphous/I0 galaxies may be even higher than it is in normal late-type spirals. These results might be accounted for by assuming that the rate at which intermediate-age binaries containing white dwarfs evolve into SN Ia is much higher than that for old white-dwarf binaries. The implications of this result for the evolution of elliptical galaxies are briefly discussed.

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