Time-dependent chemistry. III - The effects of sulphur and oxygen depletion on the interstellar abundances of sulphur-bearing molecules

Details Time-dependent chemistry. III - The effects of sulphur and oxygen depletion on the interstellar abundances of sulphur-bearing molecules Time-dependent chemistry. III - The effects of sulphur and oxygen depletion on the interstellar abundances of sulphur-bearing molecules

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..157w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 213, March 1, 1985, p. 157-166. Research supported by t

Astronomy and Astrophysics

Astronomy

21

Interstellar Chemistry, Interstellar Gas, Molecular Clouds, Oxygen, Sulfur, Time Dependence, Abundance, Carbon, Depletion, Ionic Collisions, Molecular Collisions, Molecular Interactions, Sulfur Oxides

Scientific paper

A time-dependent treatment of chemical modelling in dense interstellar clouds has been used to investigate the effects of different initial values for the carbon:oxygen ([C]/[O]) abundance ratio. The chemical network used involves 44 species (nitrogen chemistry omitted) and a range of cloud densities from n(H2) = 103 to 106cm-3. If excess carbon remains after CO formation, which dominates all usage of C and O, this leads to enhanced quantities of CS and H2CS. For a residual excess of oxygen the enhanced sulphur species are OCS and SO2 with SO only peaking for [C]/[O] near to the solar ratio. The chemistry is not driven by collisions with H2 molecules, and does not produce strong molecular enhancements with increasing density.

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