Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..80..337p&link_type=abstract
Astrophysics and Space Science, vol. 80, no. 2, Dec. 1981, p. 337-347.
Astronomy and Astrophysics
Astrophysics
3
Carbon, Carbon Monoxide, Interstellar Chemistry, Interstellar Gas, Molecular Clouds, Abundance, Astronomical Models, Gas Density, Interstellar Radiation
Scientific paper
A chemical network is set up to determine the formation and destruction of C(+), C, CO and other species, and it is applied to spherical clouds in the normal interstellar radiation field. The adopted spherical geometry gives results different from those for slab models, and the sensitivity of chemical species to chemical and astronomical parameters is explored. Astrophysical parameters of greatest importance are found to be density, temperature, and depletion. The effect of grain surface chemistry on C(+) and C is small, and for CO, grains have negligible effect in low density clouds or in high density clouds where most of the available carbon is in CO.
Pickles J. B.
Williams David. A.
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