Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8356w&link_type=abstract
HST Proposal ID #8356
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8356 Interstellar And Intergalactic Matter
Scientific paper
Understanding interstellar dust and its role in the universe is very important. Virtually all observations of astrophysical objects and their physical processes are affected by the presence of dust either within the system being studied or along its line of sight. We propose a research program that will appreciably enhance our knowledge of dust properties. The 11 Faint Object Spectrograph datasets identified in the proposal represent a significant fraction of all available ultraviolet interstellar polarimetry. These data will be used to probe the connection of the grain size distribution with sightline environment by employing such powerful techniques as the maximum entropy method. We also propose an analysis of the Goddard High Resolution Spectrograph data for HD 147933, one of only two objects with an observed polarized 0.218 micron extinction feature. This aspect of our program will derive gas phase abundances for several elements in an effort to provide further insight into the unique nature of this sightline.
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