Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8415c&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #84.15; Bulletin of the American Astronomical Society, Vol. 26, p.1459
Other
Scientific paper
The solid carbon monoxide (CO) feature at 4.67 microns gives a spectroscopic signature of dust in the coldest regimes of dense molecular clouds. Field stars provide an important means for probing molecular clouds where icy mantles are most likely to form. Combining observations of field stars with those of protostars allows a comparison of the extent of grain processing in protostellar environments to be made. High resolution data taken at UKIRT for the Taurus dark cloud enables us to fit laboratory mixtures to the solid CO data. These data present strong new evidence for the presence of carbon dioxide (CO_2) in the grain mantles around the embedded objects. The long-wavelength wing of the water-ice feature (between 3.2 and 3.6 microns) contains the C-H stretching vibrations in carbon-bearing molecules. Using CGS 4 on UKIRT, we have observed the 3 microns spectral region in embedded objects and heavily obscured field stars in Taurus. In our preliminary analysis, we find little evidence of the 3.54 microns methanol (CH_3OH) feature in any of these sources. These non-detections are significant and suggest that CH_3OH might not be widespread in molecular clouds but restricted to processed regions around protostars. It is important to understand why the methanol feature has only been detected towards the very luminous protostars observed by other groups.
Adamson Andrew J.
Chiar Jean E.
Kerr Thomas H.
Whittet Douglas C. B.
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