Late-Time Optical and Ultraviolet Spectra of SN 1979C and SN 1980K | Zendy

Robert A. Fesen | Zendy; Christopher L. Gerardy | Zendy; A. V. Filippenko | Zendy; T. Matheson | Zendy; Roger A. Chevalier | Zendy; R. Kirshner | Zendy; B. Schmidt | Zendy; P. Challis | Zendy; Claes Fransson | Zendy; B. Leibundgut | Zendy; Schuyler D. Van Dyk | Zendy

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Late-Time Optical and Ultraviolet Spectra of SN 1979C and SN 1980K

Author(s) -

Robert A. Fesen,

Christopher L. Gerardy,

A. V. Filippenko,

T. Matheson,

Roger A. Chevalier,

R. Kirshner,

B. Schmidt,

P. Challis,

Claes Fransson,

B. Leibundgut,

Schuyler D. Van Dyk

Publication year - 1999

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300751

Subject(s) - physics , doubly ionized oxygen , astrophysics , emission spectrum , spectral line , supernova , hubble space telescope , astronomy , galaxy

A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad5500 km s^{-1} emission lines of H\alpha, [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 presenceof strong [S II] 4068,4072 A emission but a lack of [S II] 6716,6731 A emissionsuggests electron densities of 10^{5-6} cm^{-3}. From the 1997 spectra, weestimate an H\alpha flux of 1.3 \pm 0.2 \times 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.Comment: 21 pages, 8 figures, submitted to the Astronomical Journa

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