Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..355h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 355-367. Research supported by the Space Telescope Sc
Astronomy and Astrophysics
Astrophysics
100
Abundance, Helium, Infrared Spectra, Iron, Supernovae, White Dwarf Stars, Emission Spectra, Kinetic Energy, Light Curve, Stellar Composition, Stellar Mass
Scientific paper
A near-infrared spectrum and several optical spectra of SN 1983N obtained over a period from 10 days before maximum light to about a week after maximum and of SN 1984L from about maximum light to about 60 days later are presented. On the basis of these spectra it is argued that the first definite identification of helium in supernova ejecta near maximum light has been made. The emergence of oxygen emission lines which presage the dramatic transition to the supernebular phase is identified. Supernova atmosphere models which are consistent with the observations are presented, and it is argued that a strong departure of helium level populations from LTE is necessary. The current status of SNe Ib, the arguments that they result from core collapse in moderately massive stars, and some of the immediate work necessary to further clarify the nature of these events are summarized.
Barker Edwin S.
Cochran Anita L.
Dinerstein Harriet L.
Downes Ronald A.
Garnett Don R.
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