Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..245g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 245-264.
Astronomy and Astrophysics
Astrophysics
38
Carbon Monoxide, Emission Spectra, Molecular Clouds, Absorption Spectra, Abundance, Astronomical Models, Electron Transitions, Line Spectra, Physical Properties, Ultraviolet Radiation
Scientific paper
Optical absorption line observations and millimeter emission of the high-latitude cloud toward the star HD 21021 are reported. The cloud was mapped with the ESO submillimeter telescope. Maps of (C-12)O and (C-13)O emission are presented and the line profiles and velocity structure of the cloud are discussed. The optical absorption line observations allow an independent determination of the H2 column density along the line of sight. The molecular column densities found in this cloud were consistent with those measured in diffuse and translucent clouds. Attention is given to the physical and chemical properties of the cloud with reference to chemical models. Analysis indicates that small fluctuations in H2 column density and other factors can produce large variations of CO abundance and column density in clouds where carbon is just being transformed into CO.
Black John Harry
de Vries Cor P.
Gredel Roland
van Dishoeck Ewine F.
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