Composition of Gas in Individual Interstellar Clouds: Cycle 1 Observations

Details Composition of Gas in Individual Interstellar Clouds: Cycle 1 Observations Composition of Gas in Individual Interstellar Clouds: Cycle 1 Observations

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3215o&link_type=abstract

HST Proposal ID #3215

Computer Science

Hst Proposal Id #3215

Scientific paper

The observations requested for the one star in Cycle 1 form part of a program in interstellar matter research, using the Goddard High Resolution Spectrograph to obtain precise measures of ultraviolet interstellar absorption lines, using the highest spectral resolution. For each star to be observed in this program, column densities will be determined for atoms of 17 atomic species of 10 elements. 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 varies 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 equilibrium between gas and grains, i.e., how the gas condenses on the grains and how the grains are destroyed by a variety of phenomena occurring in interstellar clouds.

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