Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..771v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 771-802.
Astronomy and Astrophysics
Astrophysics
695
Carbon Monoxide, Interstellar Chemistry, Interstellar Gas, Photodissociation, Hydrogen, Isotope Effect, Radiation Distribution, Ultraviolet Absorption
Scientific paper
Recent work on the vacuum ultraviolet absorption spectrum of CO by Letzelter et al. and Yoshino et al. has clarified the nature of its photodissociation processes. The application of these spectroscopic data to the description of the photodissociation of interstellar CO and its principal isotopic varieties 13CO, C18O, and 13C18O is discussed. The unattenuated photodissociation rate of interstellar CO is ≡2 × 10-10s-1, more than an order of magnitude larger than the value used in previous models. The new treatment of the CO photodissociation has been incorporated into detailed models of the structure and chemistry of interstellar clouds. Computed abundances of CO and related species C and C+ are presented for a variety of interstellar clouds ranging from diffuse clouds to dense photodissociation regions. The model results are compared with a variety of observational data on both the CO and C abundances in such clouds.
Black John Harry
van Dishoeck Ewine F.
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