Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..112h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Feb. 1987, p. 112-115. Research supported by the A.
Astronomy and Astrophysics
Astronomy
15
Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry, Stellar Winds, Supernovae, Balmer Series, Explosions, Light Curve, Stellar Envelopes, Ubv Spectra
Scientific paper
Optical spectra near the maximum light of the type II-L supernova 1984E in NGC 3169 reported by Gaskell (1985) and Dopita et al. (1984) contained narrow Balmer line profiles which showed that the explosion took place inside a dense circumstellar shell. Spectrophotometric data obtained a month after maximum light, which show little or no emission from the circumstellar shell, are presented. If the shell was swept up by the expanding ejecta within a month of maximum light, it must have been produced within the last 200 years before the supernova explosio. Either of the alternative possibilities for the origin of type II-L explosions might be able to account for a brief superwind prior to the explosion.
Branch David
Henry Richard B. C.
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