The Type IC supernova 1994I in M51: detection of helium and spectral evolution
Citation:
Filippenko, Alexei V.; Barth, Aaron J.; Matheson, Thomas; Armus, Lee; Brown, Michael; Espey, Brian R.; Fan, Xiao-Ming; Goodrich, Robert W.; Ho, Luis C.; Junkkarinen, Vesa T.; Koo, David C.; Lehnert, Matthew D.; Martel, Andre R.; Mazzarella, Joseph M.; Miller, Joseph S.; Smith, Graeme H.; Tytler, David; Wirth, Gregory D. 'The type IC supernova 1994I in M51: detection of helium and spectral evolution, in Astrophysical Journal Letters, 450, 1995, pp. L11-L15.Download Item:
Abstract:
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 l10830 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.
Author's Homepage:
http://people.tcd.ie/espeybDescription:
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Author: ESPEY, BRIAN RUSSELL
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American Astronomical SocietyType of material:
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450Availability:
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