Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450l..11f&link_type=abstract
Astrophysical Journal Letters v.450, p.L11
Astronomy and Astrophysics
Astronomy
85
Stars: Binaries: Close, Stars: Evolution, Stars: Mass Loss, Stars: Supernovae: General, Stars: Supernovae: Individual Alphanumeric: Sn 1984L, Stars: Supernovae: Individual Alphanumeric: Sn 1987M, Stars: Supernovae: Individual Alphanumeric: Sn 1994I
Scientific paper
We present a series of spectra of SN 1994I in M51, starting 1 week prior to maximum brightness. The nebular phase began about 2 months after the explosion; together with the rapid decline of the optical light, this suggests that the ejected mass was small. Although lines of He I in the optical region are weak or absent, consistent with the Type Ic classification, we detect strong He I lambda 10830 absorption during the first month past maximum. Thus, if SN 1994I is a typical Type Ic supernova, the atmospheres of these objects cannot be completely devoid of helium. The emission-line widths are smaller than predicted by the model of Nomoto and coworkers, in which the iron core of a low-mass carbon-oxygen star collapses. They are, however, larger than in Type Ib supernovae.
Armus Lee
Barth Aaron J.
Brown Michael
Espey Brian R.
Fan Xiao-ming
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