Other
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262.1047k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 1047-1056.
Other
45
Absorption Spectra, Carbon Monoxide, Infrared Spectra, Interstellar Matter, Molecular Clouds, Line Shape, Line Spectra, Optical Thickness
Scientific paper
Infrared spectra centered on the solid CO feature at 4.76 microns are presented for seven embedded objects in the Rho Oph molecular cloud. Synthetic spectra based on laboratory data for various ice mixtures containing CO are compared with the observations, in an attempt to constrain the abundances of both CO and other grain mantle constituents. The profiles indicate that the CO is embedded in only two types of matrix: pure (or nearly pure) CO, and H2O. A large abundance of CO2 mixed with CO in the mantles is ruled out. There are at least two components to the absorption in most cases, attributed to two or more different grain environments. Column densities of solid CO in these regions are presented, along with upper limits on the depth of the CO feature for a further eight lines of sight in the cloud. The features reflect varying physical and chemical conditions within the Rho Oph cloud. The composite features are fundamentally different within current observational limits from those seen in the Taurus dark cloud.
Adamson Andrew J.
Kerr Thomas H.
Whittet Doug C. B.
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