Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..672w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 672-679.
Astronomy and Astrophysics
Astrophysics
43
Binary Stars, Light Curve, Stellar Mass Ejection, Supernova Remnants, Protostars, Stellar Models, Stellar Winds
Scientific paper
Examination of the short-term deviations from the best-fit model light curves for 10 years of measurements on the radio supernova SN 1979 C at 20 and 6 cm shows periodic behavior. With an observed period of about 1575 days, model interpretations imply an approximately 8 percent modulation of the presupernova stellar wind density on a time scale of about 4000 yr. These observations therefore provide the first direct evidence for the periodic modulation of stellar winds on long time scales. Although any interpretations remain tentative at this point, the mechanism may involve modulation of the mass loss in a stellar wind from the presupernova red supergiant either as a result of pulsational instability or, more likely, by interaction with a massive companion star in a highly eccentric binary orbit, similar to the conditions in the VV Cephei star systems.
Panagia Nino
Pringle James E.
Van Dyk Schuyler D.
Weiler Kurt W.
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