Issue |
A&A
Volume 388, Number 1, June II 2002
|
|
---|---|---|
Page(s) | 346 - 354 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20020489 | |
Published online | 28 May 2002 |
Surface hydrogenation in diffuse and translucent interstellar clouds
University College London, Gower Street, London WC1E 6BT, UK
Corresponding author: S. Viti, sv@star.ucl.ac.uk
Received:
15
March
2001
Accepted:
28
March
2002
We investigate the effects of grain-surface hydrogenation reactions on
gas phase chemical models of diffuse and translucent clouds in the
interstellar medium.
Models in which gas phase species freeze out on to dust without release do
not match observed column densities well.
Expanding on previous work we extend our models to
include the release of C, N, O, S and CO following hydrogenation on the
grain surface.
The results show that such mechanisms do improve the ability of chemical
models to reproduce observed abundances, not only through the release of
otherwise frozen-out species but also because of the additional
hydrogenating reactions.
For example, the predicted column densities of in diffuse clouds
and
and
in translucent clouds match observations
better in models with grain-surface hydrogenation.
Key words: astrochemistry / molecular processes / ISM: abundances / ISM: molecules
© ESO, 2002
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