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Date and Time of the Query: 2019-08-22 T14:06:34 PDT
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For refcode 1992ApJ...399..672W:
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Copyright by American Astronomical Society. Reproduced by permission
1992ApJ...399..672W EVIDENCE FOR PERIODIC MODULATION OF PRESUPERNOVA MASS LOSS FROM THE PROGENITOR OF SN 1979C KURT W. WEILER AND SCHUYLER D. VAN DYK Center for Advanced Space Sensing, Naval Research Laboratory, Code 4215, Washington, DC 20375-5000 JAMES E. PRINGLE Space Telescope Science Institute, 2700 San Martin Drive, Baltimore, MD 21218 AND NINO PANAGIA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, and University of Catania, Italy Received 1992 February 14; accepted 1992 May 14 ABSTRACT Examination of the short-term deviations from the best-fit model light curves for 10 years of measurements on the radio supernova SN 1979C at 20 and 6 cm shows periodic behavior. With an observed period of ~1575 days, model interpretations imply an ~8% modulation of the presupernova stellar wind density on a time scale of ~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. Subject headings: binaries: close - stars: mass loss - supernovae: individual (SN 1979C)
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