Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5883k&link_type=abstract
HST Proposal ID #5883
Other
Hst Proposal Id #5883 Interstellar Medium
Scientific paper
We will obtain high- and intermediate-resolution GHRS spectra of the +70 km/sec HVC seen toward HD 203664 in optical and radio spectra. The observations will provide a unique opportunity to quantify the ionization structure of a HVC and accurately determine the chemical abundances of important elements such as C, N, O, Mg, Si, S, Cr, Mn, Fe, and Zn in high velocity interstellar material. Our high spectral resolution optical data suggest that substructure may exist within the HVC which, if confirmed, would support the possibility that early-type stars at large distances from the Galactic plane are formed through star formation induced by collisions between cloudlets within HVCs. We will test this hypothesis on the HD 203664 HVC with high S/N absorption line measurements made by the GHRS in its highest resolution mode. By combining a supporting set of optical and radio data with the ultraviolet observations, we will study the velocity structure of the HVC, morphology, distance, and physical conditions of this HVC in greater detail than has been possible for any other high velocity cloud in the sky.
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