Supernova 1993J - Explosion of a Massive Cool Supergiant with a Small Envelope Mass

Details Supernova 1993J - Explosion of a Massive Cool Supergiant with a Small Envelope Mass Supernova 1993J - Explosion of a Massive Cool Supergiant with a Small Envelope Mass

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275l..29h&link_type=abstract

Astronomy and Astrophysics, Vol.275, NO.2/AUG(II), P. L29, 1993

Astronomy and Astrophysics

Astrophysics

41

Scientific paper

First results of the attempt to unveil the nature of the unusual Type II supernova 1993J in the nearby galaxy M81 are reported. Detailed modeling of the progenitor evolution, explosion, supernova B and V band brightness evolution, spectral features, and γ-ray emission have been performed. Our results allow tentative conclusions concerning the pre-supernova structure, explosion energy, ^56^Ni synthesis, and reddening towards the supernova. The most likely model is that of a cool massive (M_ZAMS_ ~ 25 - 30 M_sun_) single star which has lost the major part of its envelope prior to the explosion. This model is also consistent with radio and X-ray observations. We give predictions on the further evolution of SN 1993J and conclude that a positive detection of γ-rays with COMPTEL may be possible already at quite early times.

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