Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2257s&link_type=abstract
HST Proposal ID #2257
Physics
Hst Proposal Id #2257
Scientific paper
We will obtain high and intermediate resolution HRS observations of interstellar absorption produced by N V, C IV, Si IV, Al III and Mn II toward 2 halo stars. The target stars have been carefully selected from the existing IUE data base of high resolution spectra of distant B stars in the galactic halo. The data will be used to study the line broadening of N V, C IV and Si IV to determine if there is evidence that these lines are formed in collisionally ionized gas at temperatures in the range log T = 4.8 to 5.3 or formed in photoionized gas near log T = 4. In addition, we will study the general prevalence of interstellar N V absorption, the distribution of the various species away from the galactic plane and the velocity correspondance between the lines of high, intermediate and low ionization. Our overall goal is to obtain new information about the physical conditions of the gas in the galactic halo. With this information we hope to better understannd the origin of galactic halo gas. The HRS is required for these observations because of its superior resolution and signal to noise characteristics over the spectrographs of the IUE satellite.
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