The Luminosities of Supernovae of Type Ia Derived from Cepheid Calibrations | Zendy

Sidney van den Bergh | Zendy

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The Luminosities of Supernovae of Type Ia Derived from Cepheid Calibrations

Author(s) -

Sidney van den Bergh

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/178075

Subject(s) - physics , supernova , astrophysics , cepheid variable , luminosity , galaxy , observable , type (biology) , astronomy , stars , ecology , quantum mechanics , biology

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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