A reassessment of the double isotope ratio (C-13)O/C(O-18) in molecular clouds

Details A reassessment of the double isotope ratio (C-13)O/C(O-18) in molecular clouds A reassessment of the double isotope ratio (C-13)O/C(O-18) in molecular clouds

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..293t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 293-298.

Astronomy and Astrophysics

Astrophysics

20

Abundance, Carbon Monoxide, Ground State, Molecular Clouds, Nebulae, Isotopes, Millimeter Waves

Scientific paper

Previous published and new mm-wave CO isotopic data are used to study the double isotope ratio, (C-13)O/C(O-18) in molecular clouds. The ground-state column density ratios in giant molecular clouds show a value that is higher than that shown in dark clouds by a factor of 2-4. Large increases in the column density ratio at low extinctions are observed in all of the data. It is suggested that unresolved local density fluctuations may be responsible for the observed enhancement in the (C-13)O/C(O-18) column density ratios in the giant molecular clouds.

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