Isotopic abundance of CO in interstellar clouds

Details Isotopic abundance of CO in interstellar clouds Isotopic abundance of CO in interstellar clouds

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212l..39l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 212, Feb. 15, 1977, p. L39-L42.

Astronomy and Astrophysics

Astrophysics

49

Abundance, Carbon Monoxide, Carbon 13, Interstellar Gas, Ultraviolet Radiation, Carbon 12, Galactic Evolution, Hydrogen Ions, Ionic Reactions, Molecular Ions, Time Dependence

Scientific paper

The fractional abundances of the isotopic species of carbon monoxide in interstellar clouds are calculated on a basis of gas-phase ion-molecule reactions. The (C-13)O/(C-12)O ratio varies significantly with extinction of the ultraviolet radiation field, and in the outer regions of dark dense clouds (C-13)O may be enhanced by a factor of 10. The observational interpretation of the CO to H2 or interstellar-reddening relation and the isotopic abundances of carbon are complicated by these effects.

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