Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5443c&link_type=abstract
HST Proposal ID #5443
Physics
Hst Proposal Id #5443 Interstellar Medium Absorption Lines
Scientific paper
The exploration of interstellar gas-phase abundances in the Galaxy, particularly along long pathlengths sampling relatively low density gas, provides vital information on the process of nucleosynthetic enrichment and the degree to which the gas is mixed in both the radial and vertical directions. Of particular interest to us here is the study of abundance variations, specifically abundance gradients, in the gas in the galactic disk and low halo. We propose to obtain GHRS high resolution (3.5 km/s) Ech-B observations of absorption line profiles of several elements arising from two distinct nucleosynthetic origins. We will use 4 sightlines in the general direction of the galactic center, each sampling relatively low density intercloud gas where the degree of depletion of heavy elements onto dust is relatively low. These sight lines, which sample both sides of the galactic center, take maximum advantage of the velocity lever-arm provided by galactic rotation. By allowing us to relate absorption as a function of LSR velocity to galactocentric radius, we will be able to produce abundance gradient data down to galactocentric radii as small as 3.5 kpc.
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