Spectra of two very old supernovae - SN 1986J and SN 1980K

Details Spectra of two very old supernovae - SN 1986J and SN 1980K Spectra of two very old supernovae - SN 1986J and SN 1980K

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..531l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 531-544.

Astronomy and Astrophysics

Astrophysics

85

Stellar Evolution, Stellar Spectra, Supernova Remnants, Supernovae, Nebulae, Radio Emission, Spectral Line Width, Stellar Envelopes

Scientific paper

Spectra are presented for SN 1986J in NGC 891, observed 4 and 7 years after the explosion, and SN 1980K, observed 9 years after maximum light. A narrow-line and a broad-line component are noted in SN 1986J; these are respectively attributed to a circumstellar shell and the actual stellar interior (without hydrogen). SN 1980K continues to emit in very broad lines. Comparison with earlier observations suggests that this SN halted its exponential flux decline in the early 1980s, and is currently emitting at a constant rate. In both SNs studies, the identity of the energy source which sustains emission remains uncertain.

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