Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3444s&link_type=abstract
HST Proposal ID #3444
Physics
Hst Proposal Id #3444
Scientific paper
Column densities of interstellar atoms of 17 atomic species of 10 elements will be measured in the line-of-sight to 2 early-type stars, using the Goddard High Resolution Spectrograph to obtain precise measures in the ultraviolet with the highest available spectral resolution. These data will be analyzed to determine relative abundances in the several individual clouds present along each line of sight, and thus to determine how the composition of the gas in such clouds and the various physical processes occurring vary with cloud parameters such as H column density, velocity, ionization level, and distance z from the galactic plane. This information should help to clarify the many physical processes occurring in interstellar gas. In particular, measures of stars in the galactic halo should help to identify the mechanisms responsible for the abundant C IV, Si IV, and N V known to be present in the interstellar gas at kiloparsec distances from the galactic plane. The program should also increase our understanding of the balance between formation and destruction of interstellar dust grains.
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