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Hydrocarbon emission features in the IR spectra of warm supergiantsObservations in the 3-13 micron range are presented for two objects possessing the unidentified 21-micron feature, IRAS 22272 and IRAS 07134, which were obtained in the course of search for circumstellar aromatic hydrocarbon (PAH) emission bands. The 3.3 and 6.2 micron bands are attributed to circumstellar PAH molecules, and the 6-9 micron plateau and the 12- and 6.9-micron lines are attributed to larger, aromatic hydrocarbon clusters. These are the coolest stars known to exhibit the IR emission bands. The 21-micron feature is conjectured to also originate in a carbonaceous carrier.
Document ID
19910033205
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Buss, R. H., Jr.
(NASA Ames Research Center Moffett Field, CA, United States)
Cohen, M.
(NASA Ames Research Center Moffett Field, CA, United States)
Tielens, A. G. G. M.
(NASA Ames Research Center Moffett Field, CA, United States)
Werner, M. W.
(NASA Ames Research Center Moffett Field, CA, United States)
Bregman, J. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
December 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A17828
Distribution Limits
Public
Copyright
Other

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