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1998ApJ...506..874M - Astrophys. J., 506, 874-879 (1998/October-3)
Radio observations of SN 1980K: evidence for rapid presupernova evolution.
MONTES M.J., VAN DYK S.D., WEILER K.W., SRAMEK R.A. and PANAGIA N.
Abstract (from CDS):
It is suggested that this decrease in emission may be due to the supernova (SN) shock entering a new region of the circumstellar material that has a lower density than that expected for a constant speed (w), constant mass-loss rate M{dot} wind from the progenitor. If such an interpretation is correct, the difference in wind and shock speeds appears to indicate a significant evolution in the mass-loss history of the SN progenitor ∼104 yr before explosion, with a change in circumstellar density ∝M{dot}/w occurring over a time span of ≲4 kyr. Such features could be explained in terms of a fast ``blue-loop'' evolutionary phase of a relatively massive pre-SN progenitor star. If so, we may, for the first time, provide a stringent constraint on the mass of the SN progenitor based solely on the SN's radio emission.
Abstract Copyright: ∼
Journal keyword(s): Radio Continuum: Stars - Stars: Evolution - Stars: Supernovae: Individual: Alphanumeric: SN 1980K
Simbad objects: 8
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