Other
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.192...51m&link_type=abstract
In ESA Galactic and Extragalactic Infrared Spectroscopy p 51-55 (SEE N83-18593 08-88)
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1
Absorption Spectra, Carbon Dioxide, Infrared Spectra, Molecular Clouds, Protostars, Condensation, Interstellar Gas, Irradiation, Spectral Signatures
Scientific paper
Spectra in the region of the CO 4.6 microns fundamental band of seven compact infrared sources in molecular clouds are presented. The resolving power of 830 is sufficient to show that in W33A and NGC 7538/IRS 9 three distinct features contribute to a strong absorption near 4.6 microns. Comparison of the astronomical data with laboratory CO absorption spectra establishes that the two strongest features are due to cold, solid CO. The three features vary in strength with respect to each other amongst the observed sources, behavior that can also be reproduced in the laboratory by a combination of temperature cycling and UV irradiation of the sample. The implications for the condensation of CO, and the masses of giant molecular clouds according to the ideas of Leger (1982) are briefly discussed.
Allamandola Lou
Baas F.
Greballe T. R.
Lacy John H.
Lonsdale Colin J.
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