Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..245n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 245-256.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Models, Chemical Composition, Interstellar Chemistry, Molecular Clouds, Abundance, Carbon, Chemical Reactions, Nitrogen, Oxygen
Scientific paper
A steady-state chemical composition model of the molecular cloud in front of the star HD 29647 in Taurus was developed. This chemical model scheme involves 2472 reactions among 168 chemical species formed from H, C, N, O, S, the isotopic substitutions D, C-13, and O-18, and the heavy elements Mg, Fe, and Si. A good fit to the observations of the molecular cloud was obtained by adopting a constant density n(H) = 800/cu cm and a uniform low temperature T = 10 K, with carbon, nitrogen, and oxygen slightly depleted (depletion factors 4, 2, and 2, respectively) and sulfur and metals depleted strongly (depletion factors 100 and 1000). An enhanced cosmic ray ionization rate of 5 x 10 to the -17th/s must also be invoked for an agreement between the model calculations and the observations. The mean electron abundance was found to be 0.00003.
Benayoun Jean-Jacques
Nercessian E.
Viala Y. P.
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