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The interstellar C-H stretching band near 3.4 microns - Constraints on the composition of organic material in the diffuse interstellar mediumThe composition and history of dust in the diffuse ISM was studied using 3600-2700/cm absorption spectra of objects which have widely varying amounts of visual extinctions along different lines of sight. The 3300/cm and 2950/cm features are attributed to O-H and C-H stretching vibrations, respectively. The O-H feature in OH 32.8-0.3 is suggestive of circumstellar water ice and is probably not due to material in the diffuse ISM. The features in the 3100-2700/cm region are attributed either to C-H vibrations or to M stars. The spectra of the latter show a series of narrow features in this region that are identified with photospheric OH. Objects in which these bands are seen include OH 01-477, T629-5, and the Galactic center source IRS 7. The C-H stretch feature of diffuse ISM dust has subpeaks which fall within 5/cm of C-H stretching vibrations in the -CH2- and -CH3 groups of saturated aliphatic hydrocarbons.
Document ID
19910048944
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sandford, S. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Allamandola, L. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Tielens, A. G. G. M.
(NASA Ames Research Center Moffett Field, CA, United States)
Pendleton, Y.
(NASA Ames Research Center Moffett Field, CA, United States)
Sellgren, K.
(Hawaii, University Honolulu; Ohio State University, Columbus, United States)
Date Acquired
August 14, 2013
Publication Date
April 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 371
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A33567
Distribution Limits
Public
Copyright
Other

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