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On the possible bipolar nature of 21 micron IRAS sourcesThe discovery of another IRAS source (22574 + 6609) showing the unidentified 21-micron emission feature is reported. Its overall energy distribution is similar to the well-known edge-on bipolar nebulae AFGL 2688 and AFGL 618. Ground-based optical and infrared observations of this object and two other 21-micron sources show that while all three have very similar infrared properties, they differ greatly in the visual region. All three of these 21-micron sources are intrinsically similar bipolar nebulae, viewed at different orientations.
Document ID
19910041752
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hrivnak, Bruce J.
(Valparaiso University IN, United States)
Kwok, S.
(Joint Institute for Laboratory Astrophysics, Boulder, CO; Calgary, University Canada)
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
91A26375
Distribution Limits
Public
Copyright
Other

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