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Multiple shells in the circumstellar envelope of IRC+10216 *
N. Mauron 1 and
P.J. Huggins 2
Received 28 April 1999 / Accepted 14 June 1999
We report deep B and V-band images of IRC+10216 which reveal its extended circumstellar envelope in dust scattered, ambient Galactic light. The envelope is detected out to from the central star and its structure records the mass-loss history over the past 8,000 yr. The envelope is roughly spherically symmetric but is composed of a series of discrete, incomplete, concentric shells. The shells are thin (-) and separated by -20", which corresponds to -800 yr. The shells suggest that some process modulates the mass-loss of the star on this time scale. The presence of shells also means that models of the extended envelope which have been based on smooth distributions of the circumstellar material need to be re-examined.
Key words: stars: AGB and post-AGB stars: mass-loss stars: individual: IRC+10216 stars: circumstellar matter
* Based on observations made with the Canada France Hawaii Telescope, operated by CNRS, the National Research Center of Canada, and the University of Hawaii, and partly at the Haute Provence Observatory (CNRS).
Send offprint requests to: N. Mauron
Online publication: August 25, 1999