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IRAS observations of R Coronae Borealis - Detection and study of a fossil shellIRAS observations of the extreme hydrogen-deficient supergiant R CrB are presented and discussed. The star is surrounded by an enormous cool dust cloud which is tentatively identified as a fossil remnant of the hydrogen-rich envelope of the star. The angular extent of the emission corresponds to a linear extent of 8 pc, 20 times larger than the largest previously known shell around a late-type star. The radiating material is distributed very symmetrically over a wide range of radial distances from the star. The dust temperature is nearly constant throughout the extended shell. The total mass in the shell is about 0.3 solar mass. The ejection process appears to have occurred in a spherically symmetric fashion with a nearly constant mass loss rate and expansion velocity over a period of about 150,000 yr, terminating about 26,000 yr ago.
Document ID
19870036611
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gillett, F. C.
(Kitt Peak National Observatory Tucson, AZ, United States)
Backman, D. E.
(Kitt Peak National Observatory Tucson, AZ, United States)
Beichman, C.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Neugebauer, G.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
November 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 310
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A23885
Distribution Limits
Public
Copyright
Other

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