EDP Sciences
Free Access
Volume 424, Number 3, September IV 2004
Page(s) 905 - 917
Section Interstellar and circumstellar matter
DOI https://doi.org/10.1051/0004-6361:20040441
Published online 06 September 2004

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. Millar3

1  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 )

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: $\rho$ Oph D, L1544

SIMBAD Objects

© ESO 2004

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