Sakurai's object: ISO witnesses stellar evolution in ``real-time''

Details Sakurai's object: ISO witnesses stellar evolution in ``real-time'' Sakurai's object: ISO witnesses stellar evolution in ``real-time''

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..357k&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 357

Physics

1

Final Helium Flash, Mass Loss, Dust Formation

Scientific paper

We present ISOCAM observations of Sakurai's Object covering the wavelength range of 4 to 15 μm in seven filter bands. The photometry shows that over the period from February 1997 to February 1998 the flux over the whole range has increased by a factor of about ten. On basis of the ISOCAM and ground-based data we conclude that this increase is the result of recent mass loss from Sakurai's object and the formation of hot dust around it. Using a spherically symmetric dust radiative transfer model we get a very preliminary quantitative result for the mass loss rate of a few 10-7 Modot/year, a rather typical value for stars on the Asymptotic Giant Branch. This is in agreement with the notion that Sakurai's object is retracing its own evolutionary history as a consequence of a final helium flash.

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