The type IC (helium-poor Ib) supernova 1987M - Transition to the supernebular ph

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Title:		The type IC (helium-poor Ib) supernova 1987M - Transition to the supernebular phase
Authors:		Filippenko, Alexei V.; Porter, Alain C.; Sargent, Wallace L. W.
Affiliation:		AA(California, University, Berkeley), AB(Palomar Observatory, Pasadena, CA; National Optical Astronomy Observatories, Tucson, AZ), AC(Palomar Observatory, Pasadena, CA)
Publication:		Astronomical Journal (ISSN 0004-6256), vol. 100, Nov. 1990, p. 1575-1587, 1757. Research supported by the University of California. (AJ Homepage)
Publication Date:		11/1990
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		H ALPHA LINE, LIGHT CURVE, STELLAR EVOLUTION, STELLAR SPECTRA, SUPERNOVAE, ASTRONOMICAL PHOTOMETRY, ASTRONOMICAL SPECTROSCOPY, FORBIDDEN TRANSITIONS, STELLAR MASS EJECTION, VISIBLE SPECTRUM, WHITE DWARF STARS
DOI:		10.1086/115618
Bibliographic Code:		1990AJ....100.1575F

Abstract

Results are reported from spectroscopic observations of SN 1987M, obtained using a Cassegrain CCD spectrograph on the 3-m Shane reflector at Lick Observatory and a double spectrograph on the 5-m Hale telescope at Palomar Observatory between September 1987 and March 1988. The data are presented in tables, graphs, and sample spectra and characterized in detail. SN 1987M is found to be subluminous by 0.6 mag (somewhat less than the mean value of 1.5 mag for type Ic SNe) and to exhibit many of the other properties of SNe Ic, including strong P Cyg profiles of Ca II and O I (777.4 nm) and evidence of possible weak H-alpha emission and Co II and Fe II absorption. The rapid decline in brightness seen in multicolor CCD light curves is found to be consistent with ejection of less than about 1 solar mass.

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