The Absolute Luminosities of the Calan/Tololo Type Ia Supernovae

Details The Absolute Luminosities of the Calan/Tololo Type Ia Supernovae The Absolute Luminosities of the Calan/Tololo Type Ia Supernovae

1996-09-07

arxiv.org/abs/astro-ph/9609059v1

Astron.J. 112 (1996) 2391

Astronomy and Astrophysics

Astrophysics

21 pages, 4 figures, to appear in the Astronomical Journal

Scientific paper

10.1086/118190

We examine the absolute luminosities of 29 SNe Ia in the Calan/Tololo survey. We confirm a relation between the peak luminosity of the SNe and the decline rate as measured by the light curve, as suggested by Phillips (1993). We derive linear slopes to this magnitude-decline rate relation in BV(I)kc colors, using a sample with Bmax-Vmax < 0.2 mag. The scatter around this linear relation (and thus the ability to measure SNe Ia distances) ranges from 0.13 mag (in the I band) to 0.17 mag (in the B band). We also find evidence for significant correlations between the absolute magnitudes or the decline rate of the light curve, and the morphological type of the host galaxy.

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