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For refcode 1991AJ....101.1275U:
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1991AJ....101.1275U LATE-TIME SPECTROSCOPY OF TWO SUPERNOVAS: THE TYPE II 1980K AND THE TYPE V 1986J ALAN UOMOTO The Henry A. Rowland Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218 Received 30 October 1990; revised 11 December 1990 ABSTRACT 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 & Becker [ApJ, 351,437 (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. [AJ, 94, 61(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 ^56^Co 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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