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4.6 micron absorption features due to solid phase CO and cyano group molecules toward compact infrared sourcesSpectra obtained at a resolving power of 840, for seven protostellar sources in the region of the 4.67-micron fundamental vibrational band of CO, indicate that the deep absorption feature in W33A near 4.61 microns consists of three features which are seen in other sources, but with varying relative strength. UV-irradiation laboratory experiments with 'dirty ice' temperature cycling allow the identification of two of the features cited with solid CO and CO complexed to other molecules. Cyano group-containing molecules have a lower vapor pressure than CO, and can therefore survive in much warmer environments. The formation and location of the CO- and CN-bearing grain mantles and sources of UV irradiation in cold molecular clouds are discussed. Plausible UV light sources can produce the observed cyano group features, but only under conditions in which local heat sources do not cause evaporation of the CO molecules prior to their photoprocessing.
Document ID
19840039131
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lacy, J. H.
(California, University Berkeley, CA, United States)
Baas, F.
(California Univ. Berkeley, CA, United States)
Allamandola, L. J.
(California Univ. Berkeley, CA, United States)
Van De Bult, C. E. P.
(Leiden, Rijksuniversiteit, Sterrewacht Leiden, Netherlands)
Persson, S. E.
(California Univ. Berkeley, CA, United States)
Mcgregor, P. J.
(Mount Wilson and Las Campanas Observatories Pasadena, CA, United States)
Lonsdale, C. J.
(California, University Los Angeles, CA, United States)
Geballe, T. R.
(Groningen, Rijksuniversiteit, Groningen, Netherlands; Edinburgh, Royal Observatory, U.K. Infrared Telescope Unit, Hilo HI, United States)
Date Acquired
August 12, 2013
Publication Date
January 15, 1984
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 276
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
84A21918
Distribution Limits
Public
Copyright
Other

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