On the nature of the molecular cores in high-latitude cirrus clouds. III - (C-13)O observations and tests of CO chemistry models

Details On the nature of the molecular cores in high-latitude cirrus clouds. III - (C-13)O observations and tests of CO chemistry models On the nature of the molecular cores in high-latitude cirrus clouds. III - (C-13)O observations and tests of CO chemistry models

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..229t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 1, p. 229-248.

Astronomy and Astrophysics

Astrophysics

33

Astronomical Models, Carbon Monoxide, Cosmochemistry, Interstellar Matter, Molecular Clouds, Cirrus Clouds, Cores, Spectral Line Width, Ultraviolet Radiation

Scientific paper

(C-13)O data on 15 high-latitude cirrus cloud cores are analyzed, and the C(O-18) data of Turner et al. (1992) are reexamined in terms of generalized abundances for C(O-18) and (C-13)O derived from chemical models of Dishoeck & Black (1988). Eleven of the 13 objects which have cirrus core characteristics are found to be consistent with hydrostatic equilibrium models. In the unembellished (C-13)O analysis, the model line intensities significantly exceed observed intensities, unless additional factors or assumptions are included, the preferred one being a reduction in the external UV radiation field below the 'standard' value, as expected for high-latitude objects.

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