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Dust properties around evolved stars from far-infrared size limitsHigh angular resolution far-infrared scans were obtained of six stars surrounded by circumstellar dust shells believed to result from mass loss by the central star. None of the dust shells was clearly resolved at either 50 or 100 microns; the upper limits are in the range 4 to 10 arcsec. These size limits place constraints on the far-IR dust emissivity and dust density distribution. For one of the objects, AFGL 2343, larger than normal grains are almost certainly required. For several other stars, the size limits are much more consistent with dust having an emissivity law no steeper than 1/lambda in the 1-100-micron spectral region. For IRC + 10216, an earlier suggestion is confirmed that, assuming reasonable grain properties, a smooth radial dust distribution is not consistent with the scans and the energy distribution of the object.
Document ID
19910041751
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Harvey, Paul M.
(Texas, University Austin; Grenoble, Observatoire, Saint-Martin-d'Heres, France)
Lester, Daniel F.
(Texas, University Austin, United States)
Brock, David
(Texas, University, Austin; Joint Astronomy Center Hilo, HI, United States)
Joy, Marshall
(NASA Marshall Space Flight Center Huntsville, AL; Texas, University, Austin, United States)
Date Acquired
August 14, 2013
Publication Date
February 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 368
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A26374
Funding Number(s)
CONTRACT_GRANT: NAG2-67
Distribution Limits
Public
Copyright
Other

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