The luminosities of supernovae of type Ia derived from Cepheid observations

Details The luminosities of supernovae of type Ia derived from Cepheid observations The luminosities of supernovae of type Ia derived from Cepheid observations

1996-06-12

arxiv.org/abs/astro-ph/9606077v1

Astronomy and Astrophysics

Astrophysics

20 pages, no figures. To appear in 1996 December 1 issue of the Astrophysical Journal. Also available at: http://www.dao.nrc

Scientific paper

Available data on the luminosities of supernovae of Type Ia (SNe Ia) that have been calibrated by Cepheids are collected and discussed. The objects in the present sample show a range of ~20 in luminosity. The data strongly confirm the suspicion that SNe Ia in early-type systems are, on average, fainter than those that occur in late-type galaxies. Historical observations of S Andromedae suggest that the maximum magnitude versus rate-of-decline relationship for SNe Ia exhibits a large intrinsic dispersion. This is not surprising because the amount of 56Ni that is produced, and other observable properties of SNe Ia, are expected to depend sensitively on how much fuel is ignited.

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