The accuracy of molecular cloud abundances and isotopic ratios

Details The accuracy of molecular cloud abundances and isotopic ratios The accuracy of molecular cloud abundances and isotopic ratios

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149...90s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 90-94. Research supported by the Naturvetenskapliga

Astronomy and Astrophysics

Astrophysics

1

Abundance, Astronomical Models, Error Analysis, Interstellar Chemistry, Molecular Clouds, Radiative Transfer, Carbon 12, Carbon 13, Chemical Fractionation, Line Spectra, Oxygen 18

Scientific paper

Various methods have been used to derive molecular abundances and isotopic ratios in molecular clouds. The only secure method is full scale modelling using robust radiative transfer methods. This paper indicates a way to derive the accuracy and systematic errors of more approximate radiative transfer models. The approach is illustrated by an example. The results indicate that the 12C/13C and 16O/18O isotopic ratios in nearby molecular clouds are consistent with the solar system values. Previously suggested galactic 12C/13C gradients are not confirmed.

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