Physical and Chemical Processes in Dense Interstellar - Repeat for HOPR#77

Details Physical and Chemical Processes in Dense Interstellar - Repeat for HOPR#77 Physical and Chemical Processes in Dense Interstellar - Repeat for HOPR#77

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.5012s&link_type=abstract

HST Proposal ID #5012

Physics

Hst Proposal Id #5012 Interstellar Medium

Scientific paper

We propose to take advantage of the high sensitivity and spectral resolution afforded by the GHRS to carry out a comprehensive study of abundances in "transluscent" interstellar clouds (Av=2-5 mag) in order to: (1) determine physical conditions such as density, kinetic and molecular excitation temperatures, and radiation field intensities; (2) measure abundances relative to hydrogen, learn about the gas-dust interaction and depletion processes; and (3) determine the abundances of several molecular species, so that we can apply recent chemical models toward a better understanding of molecular processes in transluscent and denser clouds. The clouds to be observed are dense enough to produce detectable millimeter-wave emission from molecular species, yet transparent enough to yield absorption-line data from the infrared through the visible, and now through the UV. We have developed a two-part strategy (1) carry out detailed analyses of two selected clouds using 19 grating settings to obtain coverage of 64 multiplets of 33 atomic species as well as 27 bands of 14 molecules; and (2) conduct a survey of a few species in a number of stars, in order to sample more clouds and to analyze any trends that may appear as functions of varying cloud conditions.

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