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The Near--Maximum-Light Spectrum of the Type IC Supernova 1987M

An analysis of the near−maximum-light optical and near-UV spectrum of the Type Ic supernova 1987M is presented. In the spectrum, in addition to the fairly certain identifications of O I, Ca II, and optical Fe II lines, a weak Hα line, a moderately weak Si II λ6355 doublet, and the He I λ5876 line are identified. The near-UV region of the spectrum is found to result from a blend of iron peak ion lines, with only solar abundances of the iron peak elements required in the supernova atmosphere. It is concluded that hydrogen is underabundant relative to solar composition in the supernova atmosphere by at least a factor of 10; no lower limit on hydrogen abundance has been determined