Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1275u&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1275-1280. Johns Hopkins University-supported research.
Astronomy and Astrophysics
Astronomy
14
Blue Stars, Stellar Spectrophotometry, Supernovae, Variable Stars, H Alpha Line, Light Curve, Stellar Luminosity, Stellar Spectra
Scientific paper
Late-time spectra of the type II SN 1980K and the type V SN 1986J are presented. The SN 1980K spectrum is similar to one obtained nearly a year earlier by Fesen and Becker (1990) except that the Fe II multiplet 42 lines have changed relative strengths. Supernova 1986J shows a spectrum qualitatively similar to, but much fainter than, that observed earlier by Rupen et al. (1987). Its H-alpha flux declines exponentially, but not at the rate of any radioactive element expected to be formed in a supernova. Both of these objects are much brighter than expected if radioactive decay of Co-56 provided the energy source for their late-time luminosity. The optical and radio data available for SN 1986J indicates that it was probably not a true supernova but instead the outburst of a luminous blue variable similar to Eta Car.
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