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Late-Time Optical and UV Spectra of SN 1979C and SN 1980K | | Robert A. Fesen
; Christopher L. Gerardy
; Alexei V. Filippenko
; Thomas Matheson
; Roger A. Chevalier
; Robert P. Kirshner
; Brian P. Schmidt
; Peter Challis
; Claes Fransson
; Bruno Leibundgut
; Schuyler D. Van Dyk
; | | Date: |
26 Oct 1998 | | Subject: | astro-ph | | Abstract: | A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8 yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad 5500 km s^{-1} emission lines of Halpha, [O I] 6300,6364 A, and [O II] 7319,7330 A. Weaker but similarly broad lines detected include [Fe II] 7155 A, [S II] 4068,4072 A, and a blend of [Fe II] lines at 5050--5400 A. The presence of strong [S II] 4068,4072 A emission but a lack of [S II] 6716,6731 A emission suggests electron densities of 10^{5-6} cm^{-3}. From the 1997 spectra, we estimate an Halpha flux of 1.3 pm 0.2 imes 10^{-15} erg cm^{-2} s^{-1} indicating a 25% decline from 1987--1992 levels during the period 1994 to 1997, possibly related to a reported decrease in its nonthermal radio emission. | | Source: | arXiv, astro-ph/9810407 | | Services: | Forum | Review | PDF | Favorites | |
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