Cyclic models of molecular clouds - Ice retention and the C:O ratio

Details Cyclic models of molecular clouds - Ice retention and the C:O ratio Cyclic models of molecular clouds - Ice retention and the C:O ratio

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..441n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 441-448.

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13

Astronomical Models, Carbon, Interstellar Gas, Molecular Clouds, Oxygen, Stellar Mass, Cosmochemistry, Ice, Mass Ratios, Satellite Observation

Scientific paper

Attention is given to the gas in molecular clouds containing low-mass stars, with emphasis on two cases: a nonselective case, in which all the molecules in the mantle are treated uniformly, and a selective case, in which H2O is preferentially retained in the mantle, while other molecules are released. In these cyclic models the C:O ratio, representing the ratio of the total available carbon and oxygen in the gas phase, is found to depend on the cycle number, the cosmic ray ionization rate, and the nature of the desorption process. For nonselective desorption and high values of the cosmic ray ionization rate, the C:O ratio tends to decline with age as the number of cycles increases. For selective desorption, the C:O ratio tends to increase with age as the number of cycles increases. The range of values of the C:O ratio predicted in these models is approximately 0.3-1.5, i.e., very oxygen-rich to very carbon-rich. The consequences of the changes in the C:O ratio for the chemistry are explored in detail. Results are given for dense and diffuse phases of molecular clouds, and the observational consequences are discussed.

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