The late-time optical spectrum of SN 1980K

Details The late-time optical spectrum of SN 1980K The late-time optical spectrum of SN 1980K

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..157f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 157-165

Astronomy and Astrophysics

Astrophysics

15

Line Spectra, Stellar Evolution, Stellar Spectrophotometry, Supernovae, Calcium, Ferric Ions, H Alpha Line, Oxygen, Oxygen Ions

Scientific paper

Low-dispersion spectra of the Type II-L supernova 1980K taken in 1991 June and 1992 July/August are presented and compared to those obtained in 1988 and 1989. These spectra, covering the wavelength range 4600-4900 A, show broad H alpha and (O I) lambda lambda 4959, 5007. Strong emission at 7300 A is likely to be (Ca II) lambda lambda 7291, 7324 emission though some contribution from (O II) lambda lambda 7320, 7330 is possible. Emission near 7100 A, reported in one 1988 spectrum but unconfirmed in two 1989 spectra, is now clearly detected and is identified as probably (Fe II) at wavelength 7155. SN 1980K's H alpha and (O I) line fluxes over the last 4 years appear remarkably steady. Comparison with line emission predictions from late-time circumstellar interaction models show generally good agreement. However, some predicted line emission changes, notably a steep decline in H alpha flux, are not observed. If SN 1980K's H alpha flux stays near its current level of 1.7 x 10-15 ergs, useful optical spectra should remain possible for several more years. Continued spectral monitoring will help constrain late-time energy source models for Type II SNs and permit the investigation of this supernova's early remnant development.

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