Ultraviolet Spectroscopy of a High-Latitude Molecular Cloud: CYCLE3 High

Details Ultraviolet Spectroscopy of a High-Latitude Molecular Cloud: CYCLE3 High Ultraviolet Spectroscopy of a High-Latitude Molecular Cloud: CYCLE3 High

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4458v&link_type=abstract

HST Proposal ID #4458

Physics

Hst Proposal Id #4458

Scientific paper

We propose to investigate the composition of and physical conditions in an isolated, well-characterized high-latitude molecular cloud through high-resolution UV absorption spectroscopy. Observations at 5 carefully chosen grating settings will determine the abundances and excitation of at least 10 different atomic species and 6 different molecules. The measurements will provide diagnostic probes of density, temperature, and electron fraction that should be more stringent than those available through ground-based measurements. Accurate determinations of the abundances of the principal forms of interstellar carbon (C+, 12CO and 13CO), combined with existing CO millimeter data, will afford rigorous, unique tests of theories of the small-scale structure and chemistry of interstellar clouds. Such tests are crucial because this high-latitude cloud evidently occupies the regime of parameter space in which molecular species are just beginning to dominate all gas-phase abundances.

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