Chemical models of interstellar gas-grain processes. I - Modelling and the effect of accretion on gas abundances and mantle composition in dense clouds

Details Chemical models of interstellar gas-grain processes. I - Modelling and the effect of accretion on gas abundances and mantle composition in dense clouds Chemical models of interstellar gas-grain processes. I - Modelling and the effect of accretion on gas abundances and mantle composition in dense clouds

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..432b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 1, 1990, p. 432-443. Research supported by SE

Astronomy and Astrophysics

Astronomy

81

Abundance, Astronomical Models, Cosmic Dust, Interstellar Chemistry, Interstellar Gas, Molecular Clouds, Chemical Equilibrium, Ice, Magellanic Clouds, Time Dependence

Scientific paper

A model has been developed to study the time-dependent gas-grain chemical interaction in dense, quiescent interstellar clouds. Results are presented from the simplest form of this interaction: simple accretion of gas phase molecules on to dust grains in a static cloud. It is shown that gas phase evolution under accretion is nontrivial with respect to standard time-dependent models in which accretion is ignored. Substantial ice mantles consisting mostly of water and solid CO can coexist with a well-developed gas phase chemistry. The inclusion of accretion and time-dependent abundances prior to freeze-out produces good agreement with observations on time-scales relevant to the age of the dark cloud TMC-1, compared to that obtained from considering chemical equilibrium abundances.

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