Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..388e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 1, 1989, p. 388-402.
Astronomy and Astrophysics
Astronomy
17
Infrared Astronomy, Supernova 1987A, Ultraviolet Astronomy, Particle Size Distribution, Silicates, Stellar Models, Stellar Spectra
Scientific paper
The observed light curve and temperature evolution and the theoretically predicted initial UV burst of SN 1987A are used to construct models for the IR echo and scattered-light echo arising from circumstellar dust formed in the wind from the supernova progenitor's red supergiant phase. Observations of narrow UV emission lines suggest that some of this wind has been swept into a shell with a radius of order 10 to the 18th cm by the progenitor's blue supergiant wind. The UV observations also indicate a high abundance of oxygen with respect to carbon, which implies that the circumstellar dust should be composed primarily of silicate grains. Echo models are constructed by including the detailed emission and scattering properties of silicate grains and a spectrum of grain sizes. It is concluded that an IR echo has probably not been observed as of August, 1987.
Chevalier Roger A.
Emmering Robert T.
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