Mathematics – Logic
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.4514t&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #45.14; Bulletin of the American Astronomical Society, Vol. 28, p.1332
Mathematics
Logic
Scientific paper
We investigate the question on the time evolution of the progenitor population of Type Ia Supernovae (SNe Ia). Time scales for the changes to be expected depend mainly on the progenitor masses of the donor stars, the metallicity, and the star formation rate of the host galaxy. We find a rather week the sensitivity to the the initial mass function. Actual accretion rates in the progenitor system are of minor importance. Our results are applied to elliptical galaxies which, in general, have stopped star formation at z ~ 1. In principle, a comparison with observations of SNe Ia at moderate redshifts (z <= 1) provides a direct test of the progenitor evolution both by the implications on the SN Ia rate and, perhaps, systematic changes in the light curves and spectra. Alternatively, the local SN-rate in ellipticals can be compared with the observed rate in spiral galaxies. We find that the population of donor stars must include objects with masses down to at least 1.3 M_sun with masses down to at least 1.3 M_sun with ~ 1. M_sun being more likely. In the latter case, the masses of the donor stars must rather broad. Consequently, we must expect a change of the statistical properties of the progenitor systems. The possible consequences for the use of Type Ia to determine the cosmological deceleration q_o are discussed.
Hoeflich Peter
Nomoto Ken
Tsujimoto Takuji
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