Nomoto 1990 Ic SN 1987M

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Title:		The type IC supernova 1987M - Core collapse of a low-mass helium star in a binary system
Authors:		Nomoto, K.; Filippenko, A. V.; Shigeyama, T.
Affiliation:		AA(Tokyo, University, Japan; Max-Planck-Institut fuer Physik und Astrophysik, Garching, Federal Republic of Germany), AB(California, University, Berkeley), AC(Tokyo, University, Japan; Max-Planck-Institut fuer Physik und Astrophysik, Garching, Federal Republic of Germany)
Publication:		Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. L1-L4. (A&A Homepage)
Publication Date:		12/1990
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		B STARS, BINARY STARS, GRAVITATIONAL COLLAPSE, LIGHT CURVE, SUPERNOVAE, STELLAR EVOLUTION, STELLAR MASS, STELLAR MODELS, STELLAR SPECTROPHOTOMETRY, WOLF-RAYET STARS
Bibliographic Code:		1990A&A...240L...1N

Abstract

Using flux-calibrated spectra, a crude bolometric light curve of the type Ic ('helium-poor Ib') supernova 1987M is constructed. This curve has two important features that are difficult to understand in the context of previous Wolf-Rayet progenitor models: (1) near maximum brightness, SN 1987M was only about 0.5 mag less luminous than type Ia supernovae, significantly brighter than typical type Ib supernovae; and (2) the luminosity of SN 1987M fell more rapidly than that of type Ia and Ib supernovae. A theoretical light curve of an exploding 3.3 solar mass helium star which, in contrast to the previous models, is in good agreement with the observed light curve of SN 1987M is presented. It is shown that SN 1987M may have been the explosion of a helium star of 3-3.5 solar mass that began its life with 12-15 solar mass in a close binary system and gradually lost its mass to the companion.