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IRAS observations of a large circumstellar dust shell around W HydraeIRAS observations at 60 and 100 microns reveal a large 30-40-arcmin (about 1-pc) diameter dust shell centered on the oxygen-rich red giant W Hya. Except for SNRs, this is the largest mass-loss envelope, in apparent diameter, known around any evolved star, including PN. W Hya's radiation field, stronger than the interstellar radiation field in the outer envelope, is sufficient to heat dust grains with IR emissivity proportional to lambda exp -1.2 to temperatures of about 40 K implied by the ratio of intensities at 60 and 100 microns.
Document ID
19900064659
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hawkins, G. W.
(California, University Los Angeles, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Astronomy and Astrophysics
Volume: 229
Issue: 2 Ma
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
90A51714
Funding Number(s)
CONTRACT_GRANT: JPL-957267
Distribution Limits
Public
Copyright
Other

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