Fractionation of CO in the diffuse clouds toward Zeta Ophiuchi

Details Fractionation of CO in the diffuse clouds toward Zeta Ophiuchi Fractionation of CO in the diffuse clouds toward Zeta Ophiuchi

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..482s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 2, p. 482-491.

Astronomy and Astrophysics

Astronomy

58

Carbon Monoxide, Diffuse Radiation, Fractionation, Interstellar Gas, Molecular Clouds, Carbon Isotopes, Hubble Space Telescope, Interstellar Matter, Oxygen Isotopes, Spaceborne Astronomy, Ultraviolet Spectra

Scientific paper

An analysis of CO A-X bands in diffuse clouds toward Zeta Ophiuchi is presented. The results provide isotopic ratios that constitute the strongest observational evidence for highly localized isotopic fractionation of CO in diffuse portions of an interstellar cloud. The value of the fractionation implies that selective photodissociation is the controlling influence of the fractionation. The molecule's excitation temperature is discussed and a lower limit to the O-16/O-18 ratio is provided. The absence of CO lines from the gas that provides broad CH+ and CH lines commonly attributed to warm gas behind a shock front is addressed.

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