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Observations of Type la Supernovae

Published online by Cambridge University Press:  12 April 2016

Nicholas B. Suntzeff
Nicholas B. Suntzeff*
Affiliation:
Cerro Tololo Inter-American Observatory Casilla 603, La Serena, Chile

Abstract

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The quality of observational data on Type la supernovae has improved remarkably in the last few years, due mainly to monitoring programs with CCD-equipped detectors on small aperture telescopes at observatories across the world, and at the space observatories. I will review the recent observational characteristics of Type la supernovae, focusing the discussion on our observations of SN1992A in the SO galaxy NGC 1380 in the Fornax cluster as a reference to other Type la events. We now have strong evidence that Type la events are not a homogeneous class, but vary in both color and brightness at maximum light, vary in rise time and decline from maximum, and have spectral characteristics at maximum light that are correlated with these photometric parameters. Insofar as the SBF, PNLF, and infrared Tully-Fisher distance scales are correct, the observed (uvoir) bolometric light curves also indicate that these supernovae are less luminous than expected from the models of the explosion of a C-0 white dwarf at the Chandrasekhar mass.

Type
Type la Supernovae
Information
International Astronomical Union Colloquium , Volume 145: Supernovae and Supernova Remnants , 1996 , pp. 41 - 48
Copyright
Copyright © Cambridge University Press 1996

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