Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5896w&link_type=abstract
HST Proposal ID #5896
Other
Hst Proposal Id #5896 Interstellar Medium
Scientific paper
The study of high-velocity gas can provide significant information on such topics as the structure and evolution of interstellar shocks, the transfer of energy from stars to the ISM, and the processing of interstellar dust grains. We propose to obtain sensitive new GHRS echelle spectra toward three stars known to exhibit absorption due to high-velocity ionized gas. The goals of the proposed work are to determine the detailed properties of the individual subcomponents in the high-velocity gas and to identify characteristics of this gas useful for distinguishing it from ionized gas arising in other physical environments (e.g., photoionized H II regions, circumstellar shells). Accurate individual component column densities, line widths, and velocities for C II, C II*, C IV, Mg II, Al II, Al III, Si II, Si III, Si IV, S II, S III, and Fe II (essentially all the potentially detectable species) will yield estimates of the temperatures, densities, sizes, ionization characteristics, and depletions for the individual clouds. An understanding of both the prevalence and the detailed physical properties of high- velocity gas in our own Galaxy will aid in understanding the abundances and physical processes characterizing the absorption-line systems seen at various redshifts in the spectra of background QSOs, and thus in understanding crucial aspects of the evolution of galaxies.
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