Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..787w&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astrophysics
4
Light Curve, Nebulae, Nuclear Fusion, Supernovae, Infrared Spectra, Stellar Spectra
Scientific paper
A review is presented to examine a subgroup of Type-I supernovae which are characterized by the supernebular spectral features that are associated with Type-Ib supernovae. The development in time of the spectra are given for supernovae SN II-L 1979C, SN Ib 1884L, and SN Ic 1987M, and the spectrum of SN Ib 1983N at 235 days is compared to the nebular spectrum of an exploded 4-solar-mass helium core. Observed spectra from supernovas are compared to spectral features predicted by models for several supernova types including supernebular-phase candidates. The model developed for the supernebular phase of SN 1987A demontrates that the one-zone model is inadequate for analyzing any one line or group of lines. The outer hydrogen envelope should be considered during the supernebular phase to sample the spectra more effectively. It is concluded that an effective examination of the later phases of supernovae would include a survey of IR supernebular spectra.
Swartz Douglas A.
Wheeler Justin C.
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