Time-dependent chemistry. II - Dependence of the chemistry on the initial C/O abundance ratio

Details Time-dependent chemistry. II - Dependence of the chemistry on the initial C/O abundance ratio Time-dependent chemistry. II - Dependence of the chemistry on the initial C/O abundance ratio

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212...93w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 1, 1985, p. 93-103.

Astronomy and Astrophysics

Astronomy

23

Abundance, Carbon, Interstellar Chemistry, Molecular Clouds, Oxygen, Carbon Monoxide, Hydrocarbons, Hydroxyl Radicals, Time Dependence, Water

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 30 simple species containing only C, H and O components and a range of cloud densities from n(H2)=1000/cu cm to 1,000,000/cu cm. Primarily all the carbon and oxygen is channelled into CO, and so, the equilibrium abundance (after a few million years) reflects the abundance of the least abundant component, C or O. If excess carbon remains after CO formation, this leads to enhanced quantities of hydrocarbons, especially CH4, and if excess oxygen remains, this results in high abundances of OH and H2O. Both the oxygen-chain chemistry and carbon-chain chemistry are driven by reactions with H2 molecules so an increase in cloud density results in more efficient processing to CH4 or H2O. Formaldehyde and HCO(+) have a different behavior from the rest of the species because they contain both C and O components.

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