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A&A 424, 905-917 (2004)
DOI: 10.1051/0004-6361:20040441
The chemistry of multiply deuterated species in cold, dense interstellar cores
H. Roberts1, E. Herbst2 and T. J. Millar31 Department of Physics, The Ohio State University, Columbus, OH 43210, USA
e-mail: hroberts@mps.ohio-state.edu
2 Departments of Physics, Astronomy and Chemistry, The Ohio State University, Columbus, OH 43210, USA
3 Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK
(Received 15 March 2004 / Accepted 7 June 2004 )
Abstract
We present new models of interstellar deuterium chemistry that include more multiply deuterated species than previously considered.
We first describe the updates that have been made, and compare the results given by two different underlying networks at the
low temperatures and high densities characteristic of prestellar cores. We then use the models to explain recent observations
of CO depletion and D
2CO/H
2CO ratios in prestellar cores. We find limited agreement between our models and observations for constant density scenarios,
but for two of these cores we demonstrate reasonable agreement when we take the density structure of the core into account.
Key words: ISM: abundances -- ISM: molecules -- ISM: individual objects:
Oph D, L1544
SIMBAD Objects
© ESO 2004