Schillergäßchen 2-3, 07745 Jena, Germany
e-mail: dima@astro.uni-jena.de
2Institute of Astronomy of the RAS
Pyatnitskaya St. 48, 109017 Moscow, Russia
3Max Planck Institut für Astronomie
Königstuhl 17, D-69117 Heidelberg, Germany
Abstract:
A new efficient method allowing the reduction of the number of species
and reactions in chemical networks is outlined. We applied it to the
UMIST 95 astrochemical database in order to find a subset of species
and reactions governing the evolution of carbon monoxide under
conditions, typical of dense molecular clouds. We succeeded in isolation
of such a tiny set for the pure gas-phase chemistry which gives the
reliable estimation of the CO abundances under a wide range of the gas
temperatures, densities, and visual extinctions. We showed that the
reduction is only modest when gas-grain interactions and surface
reactions are taken into account.
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