Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328...44c&link_type=abstract
Nature (ISSN 0028-0836), vol. 328, July 2, 1987, p. 44, 45. NASA-NSF-supported research.
Astronomy and Astrophysics
Astronomy
73
Radio Astronomy, Stellar Envelopes, Stellar Models, Stellar Radiation, Supernova 1987A, Infrared Sources (Astronomy), Red Giant Stars, Stellar Mass Ejection, Stellar Winds, Supergiant Stars, X Ray Sources
Scientific paper
It is argued that radio observations of the supernova 1987A can be interpreted in terms of its interaction with circumstellar matter. The early turn-on of the radio emission implies a relatively low density circumstellar medium. The optical properties of the supernova imply that the progenitor star had a smaller radius than that of a typical type II supernova progenitor. The mass loss properties are consistent with this hypothesis. The thermal X-ray luminosity of the supernova is predicted and noted to be below the current upper limit. A bright infrared dust echo is not expected, although a weak echo from an earlier mass loss phase is possible. Weak ultraviolet emission lines from cicumstellar gas may be visible. Although the circumstellar density is low, it is possible that the progenitor star did lose a substantial fraction of its mass prior to the supernova explosion.
Chevalier Roger A.
Fransson Claes
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