The near-maximum-light spectrum of the type IC supernova 1987M

view Abstract Citations (38) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Near--Maximum-Light Spectrum of the Type IC Supernova 1987M Jeffery, David J. ; Branch, David ; Filippenko, Alexei V. ; Nomoto, Ken'ichi Abstract 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, we identify a weak H伪 line, a moderately weak Si II 位6355 doublet, and the He I 位5876 line. 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. It is also concluded that a helium star model for Type Ic supernovae is adequate and slightly favored for explaining the analyzed spectrum. The implications of the spectrum analysis for explosion models of Types Ib and Ic supernovae are discussed. Publication: The Astrophysical Journal Pub Date: August 1991 DOI: 10.1086/186123 Bibcode: 1991ApJ...377L..89J Keywords: H Alpha Line; Spectrum Analysis; Stellar Spectra; Supernovae; Ultraviolet Spectra; Visible Spectrum; Abundance; Near Ultraviolet Radiation; Astrophysics; STARS: SUPERNOVAE full text sources ADS | data products SIMBAD (10) NED (8)