Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6178o&link_type=abstract
HST Proposal ID #6178
Physics
Hst Proposal Id #6178 Interstellar Medium
Scientific paper
In this Cycle 5 GTO program, spectroscopic observations of interstellar absorption lines will be made towards 1 star in the Galactic halo and 2 stars in the Galactic disk using the Goddard High Resolution Spectrograph in its highest resolution modes. The halo star HD149881 and the disk star HD36486 will be observed with the Ech-A; these data will be combined with Ech-B data obtained for these stars in previous observing cycles. The disk star HD202904 will be observed with the Ech-B; these data will be combined with Ech-A observations for this star to be obtained with a Cycle 5 DDT program. These data will be analyzed to determine column densities in individual interstellar clouds for approximately 19 species from 11 different elements. These measurements will 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.
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