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Blob
2006-May-03, 10:35 PM
Title: A postmortem investigation of the Type IIb supernova 2001ig
Authors: Stuart D. Ryder (1), Clair E. Murrowood (1,2), Raylee A. Stathakis (1) ((1) Anglo-Australian Observatory, (2) University of Tasmania)

We present images taken with the GMOS instrument on Gemini-South, in excellent (<0.5 arcsec) seeing, of SN 2001ig in NGC 7424, ~1000 days after explosion. A point source seen at the site of the SN is shown to have colours inconsistent with being an H II region or a SN 1993J-like remnant, but can be matched to a late-B through late-F supergiant with A_V < 1. We believe this object is the massive binary companion responsible for periodic modulation in mass loss material around the Wolf-Rayet progenitor which gave rise to significant structure in the SN radio light curve.

"Stellar evolution theory suggests that a Wolf-Rayet star with a massive companion could produce this unusual kind of supernova" - Dr. Stuart Ryder.

Read more (http://au.arxiv.org/PS_cache/astro-ph/pdf/0603/0603336.pdf) (PDF)

Blob
2006-May-05, 02:08 AM
Hum,
see http://www.bautforum.com/showthread.php?t=41173