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Interpretation of the CO Bands of Supernova 1987A

Published online by Cambridge University Press:  14 August 2015

C.M. Sharp  and
P. Höflich
C.M. Sharp
Affiliation:
Max-Planck-Institute für Physik und Astrophysik, Institut für Astrophysik, Karl Schwarzchild Str.1, 8046 Garching, FRG
P. Höflich
Affiliation:
Max-Planck-Institute für Physik und Astrophysik, Institut für Astrophysik, Karl Schwarzchild Str.1, 8046 Garching, FRG

Abstract

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Model calculations for the interpretations of the CO bands in the IR are discussed. Spherical symmetry is assumed. Profiles of the physical quantities (i.e. temperature, mass, electron density, abundances, etc.) are given by NLTE models which allow for the representation of observed spectra of supernova 1987A in the optical and near infrared. C and O have to be chosen overabundant by a factor of 25 in the helium-rich layers, or a clumpy density distribution structure of a corresponding factor relative to the mean local value is needed. However, the comparison between the observed forbidden OI line at about 6300 A favours the first interpretation. A factor of about 3 has to be taken into account as uncertainty for the overabundance because of the assumptions of the background model. This implies evidence for strong mixing of the helium rich region with more central layers during the stellar evolution and/or the explosion.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 207 - 211
Copyright
Copyright © Kluwer 1989

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