Supernova absolute-magnitude distributions

Details Supernova absolute-magnitude distributions Supernova absolute-magnitude distributions

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..530m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 530-539.

Astronomy and Astrophysics

Astronomy

105

Astronomical Catalogs, Galaxies, Interstellar Extinction, Stellar Magnitude, Supernovae, Astronomical Photometry, Local Group (Astronomy), Radial Velocity, Stellar Models, Virgo Galactic Cluster

Scientific paper

The Asiago Supernova Catalogue and the Nearby Galaxies Catalog are used to study the absolute-magnitude distributions of supernovae. SNe Ia that appear to be subluminous are in highly inclined disk galaxies, which implies that the apparent dispersion in SN Ia absolute magnitudes is dominated by interstellar extinction in the parent galaxies, and, thus, that SNe Ia are good intrinsic standard candles (sigma below 0.4 mag). An upper limit to the difference between SNe Ib and SNe Ia in the B band is 1.87 mag, but the bolometric difference is smaller. Due to a large intrinsic range in peak absolute magnitude (about 6 mag), the observed sample of SNe II is severely influenced by selection effects; intrinsically faint SNe II (M/B/greater than about -17 for H0 = 75 km/s per Mpc) are much more common than intrinsically bright ones.

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