The structure of the high-latitude molecular cloud toward HD 210121
R. Gredel, E. F. van Dishoeck, C. P. De Vries, J. H. Black;
AaA, 1992, 257, 245
ABSTRACT: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.
KEYWORDS: carbon monoxide, emission spectra, molecular clouds, absorption spectra, abundance, astronomical models, electron transitions, line spectra, physical properties, ultraviolet radiation
PERSOKEY:optical, co, cirrus, absorption, h2, ,
CODE: gredel92