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NH3 in IRC +10216Ammonia has been detected in the circumstellar envelope of IRC +10216 by means of three infrared absorption lines in the nu-2 band around 950 kaysers. The profiles are well resolved at a resolution of 0.22 km/s and show that most of the circumstellar gas is accelerated to expansion velocities around 14 km/s within a few stellar radii. The observed ammonia requires a rotational temperature between 400 and 700 K, an H2 density between 100 million and 10 billion per cu cm, and an NH3 column density of 10 to the 17th per sq cm. The H2 density indicates that the mass of the circumstellar envelope within a 1 arcsec radius is about 0.1 solar mass.
Document ID
19790049169
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Betz, A. L.
(California, University Berkeley, Calif., United States)
Mclaren, R. A.
(Toronto, University Toronto, Canada)
Spears, D. L.
(MIT, Lincoln Laboratory, Lexington Mass., United States)
Date Acquired
August 9, 2013
Publication Date
April 15, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
79A33182
Funding Number(s)
CONTRACT_GRANT: NGR-05-003-452
CONTRACT_GRANT: NGL-05-003-272
Distribution Limits
Public
Copyright
Other

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