Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...162..248g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 162, no. 1-2, July 1986, p. 248-252.
Astronomy and Astrophysics
Astronomy
62
Astronomical Spectroscopy, Carbon Monoxide, Infrared Stars, Interstellar Gas, Molecular Clouds, Absorption Spectra, Astronomical Catalogs, Galactic Nuclei, Infrared Astronomy, Pre-Main Sequence Stars
Scientific paper
Spectra of fourteen bright and obscured IR objects, most of them young stars, have been measured in the 4.55-4.80 micron wavelength interval at moderate resolution. Seven of these spectra show an absorption feature at 4.675 microns, which is attributed to solid phase CO. The widths of these absorptions imply that the CO is mixed with other molecules in dust grains. In none of the spectra is there clear evidence for the broad 4.62 micron (XCN) absorption feature which is prominent in W 33 A. This suggests that XCN production does not occur over large regions of the molecular cloud, but must be localized. Gaseous CO absorption is detected, via its v = 1-0 P and R branches, towards eight of the IR objects. The gaseous CO absorption towards the galactic center is especially strong and suggests the presence along the line of sight of cold gas absorbing over a considerable velocity range.
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