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Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5389l&link_type=abstract
HST Proposal ID #5389
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Hst Proposal Id #5389 Interstellar Medium Absorption Lines
Scientific paper
GHRS/G160M spectra of interstellar CO bands and atomic lines toward two stars will be analyzed to give the column density ratio 12C16O/ 13C16O and excitation temperatures for CO and C I. The ratio of column densities will not, in general, equal the 'true' 12C/13C ratio provided by optical spectroscopy of the CH+ molecular ion. The fractionation of CO is driven in opposite directions by isotopic charge exchange and selective photodissociation. The ratio 12C16O/ 13C16O for a known 12C/13C provides novel information on the physical conditions in a diffuse cloud. These conditions are also obtained from analysis of excitation. Since different probes sample different regions of a cloud, the structure of the cloud is discernible. The proposed experiment has been applied successfully by us to Zeta Oph's diffuse clouds. Now, we propose to use fractionation and excitation as new tools to probe other portions of the Rho Oph Molecular Cloud.
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