Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..646m&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 646-661.
Astronomy and Astrophysics
Astrophysics
85
Chemical Composition, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Nebulae, Shock Waves, Abundance, Carbon, Chemical Reactions, Nitrogen, Oxygen, Tables (Data)
Scientific paper
The present investigation is concerned with detailed abundance changes resulting from the passage of a shock of 10 km/s through an interstellar cloud of initial density 100 per cu cm. Two limiting cases are considered. In the first, the postshock material is completely shielded from ultraviolet radiation. In the second case, the shocked gas is subjected to the interstellar ultraviolet radiation field with only 1 mag of extinction. In the shielded cloud, it is found that the molecules CO(+), HCO(+), O2, OH, CH(+), CH2(+), CH3(+), CH, CH2, CH3, NH, and NO reach a high abundance in the postshock gas, but decrease in abundance after the gas has cooled. In the shielded calculation, it is found that the species C, CH4, C2H2, H2O, CO2, H2CO, HCN, CN, NH3, CS, and H2CS achieve enhanced abundance and remain at a high abundance for the 100,000 years considered in the calculation.
Deveau T. J.
Mitchell George F.
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