NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The distribution and abundance of interstellar C2HC2H(N = 1-0) emission has been extensively observed in a variety of molecular clouds, including: 12 hot, dense, cloud cores, 3 bright-rimmed clouds (in NGC 1977, IC 1396, and IC 1848), and across the extended OMC - 1 cloud. It has also been observed in the circumstellar envelopes IRC + 10216 and AFGL 2688. Abundance analyses of the molecular clouds yield C2H/(C-13)O abundance ratios of about 0.01, with little variation (less than about a factor of 4) either between clouds or across individual clouds. In the Orion plateau source, the C2H abundance is enhanced by less than a factor of 4, relative to the extended cloud. The generally high levels of C2H found in the molecular clouds are not readily accounted for by simple, steady-state chemical models, and suggest, as do earlier observations of atomic carbon, that the carbon chemistry in dense clouds is more active than is commonly assumed.
Document ID
19840052082
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Huggins, P. J.
(New York Univ. New York, NY, United States)
Carlson, W. J.
(New York Univ. New York, NY, United States)
Kinney, A. L.
(New York University New York, NY, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1984
Publication Information
Publication: Astronomy and Astrophysics
Volume: 133
Issue: 2 Ap
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
84A34869
Funding Number(s)
CONTRACT_GRANT: NGR-33-016-196
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available