CO observations of interstellar clouds - Isotopic ratios

Details CO observations of interstellar clouds - Isotopic ratios CO observations of interstellar clouds - Isotopic ratios

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90...88c&link_type=abstract

Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p. 88-96.

Astronomy and Astrophysics

Astrophysics

19

Carbon Isotopes, Carbon Monoxide, Interstellar Gas, Molecular Clouds, Abundance, Astronomical Models, Cosmic Dust, Molecular Spectra

Scientific paper

The J = 1-0 transition of CO and its isotopic species in a variety of interstellar clouds was observed in order to study the correlation of the C-12(O)/C-13(O) ratio with physical conditions. In dust clouds the CO line is thermalized and the C-13(O)/C-18(O) ratio is only slightly higher than the corresponding terrestrial value. In clouds of intermediate opacity (3C 111 and 3C 133) the observations suggest that the CO is clumped in small regions colder than the H I component. The C-12(O)/C-13(O) ratio appears to be unusually low in regions of low opacity, a result that can be explained by fractionation effects.

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