The late-time optical spectrum of SN 1980K

Abstract

view Abstract Citations (16) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Late-Time Optical Spectrum of SN 1980K Fesen, Robert A. ; Matonick, David M. Abstract Low-dispersion spectra of the Type II-L supernova 198OK 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 4600-9400 A, show broad Hα and [O I] λλ6300, 6364 emission lines with flux levels similar to those seen in earlier spectra. The blueward asymmetry of the Hα line profile reported in 1988 data is not seen in the 1991/1992 spectra; however, a decrease in the Hα expansion velocity from 1988 to 1992 may have occurred. Broad and faint emission near 5000 A is interpreted as [O III] λλ4959, 5007. Strong emission at 7300 A is likely to be [Ca Il] λλ7291, 7324 emission though some contribution from [O II] λλ7320, 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 Il] λ7155. SN 1980K's Hα 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 Hα flux, are not observed. If SN 1980K's Hα flux stays near its current level of 1.7 x 1o^-15^ ergs cm^-2^ s^-1^, 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. Publication: The Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/174228 Bibcode: 1994ApJ...428..157F Keywords: Line Spectra; Stellar Evolution; Stellar Spectrophotometry; Supernovae; Calcium; Ferric Ions; H Alpha Line; Oxygen; Oxygen Ions; Astrophysics full text sources ADS | data products SIMBAD (2) NED (2)