Composition of Gas in Individual Interstellar Clouds: Cycle 5 Ddt Observations

Physics

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Hst Proposal Id #6164 Interstellar Medium

Scientific paper

In this Cycle 5 DDT program, spectroscopic observations of interstellar absorption lines will be made towards 2 stars in the Galactic disk using the Goddard High Resolution Spectrograph in its highest resolution modes. The star HD160578 will be observed with both the Ech-A and Ech-B modes. The star HD202904 will be observed only with the Ech-A; these data will be combined with Ech-B observations to be obtained for this star with a Cycle 5 GTO program. All 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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