NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-21 T20:20:54 PDT
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For refcode 1991PASP..103..787W:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1991PASP..103..787W SUPERNEBULAE. II. J. CRAIG WHEELER AND DOUGLAS A. SWARTZ Department of Astronomy, University of Texas, Austin, Texas 78712-1083 Received 1991 April 19 ABSTRACT The study of the nebular phase of supernovae continues to be a major component in the quest to understand the differences among different spectral and light-curve classifications of supernovae, to probe the inner layers of exploding stars, and to set the stage for quantitative supernova nucleosynthesis. The feature at 5900 A that is identified as [Co III] in SN Ia events is quantitatively similar to the Na D feature in SN Ib and, hence, raises questions of the identification of Co in SN Ia. The supernebular spectra of SN Ib and SN Ic are similar despite growing evidence for significant differences in their light curves and, hence, ejecta masses. The failure to detect H in the supernebular phase of SN 1987K raises questions of its type near maximum and of the relation to SN Ic. Although the amount of ^56^Ni ejected in SN 1987A is well established, the amount of oxygen, a fundamental quantity, is subject to disagreement and uncertainty. Infrared supernebular spectra, especially of He I {lambda}10830 and of [Co II] at 1.547 and 10.52 microns, of all types of supernovae could prove an extremely valuable probe of the later phases. Key words: supernovae-nebulae-emission lines-nucleosynthesis-spectra
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