Ultraviolet Interstellar Polarization

Details Ultraviolet Interstellar Polarization Ultraviolet Interstellar Polarization

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2245s&link_type=abstract

HST Proposal ID #2245

Computer Science

Hst Proposal Id #2245

Scientific paper

We propose to study interstellar polarization in the spectra of reddened early-type stars, throughout the ultraviolet range, an observation that has not previously been possible. This is an extension of work done in the optical and infrared and addresses three principal observational questions: (1) does the same empirical polarization curve (Serkowski's Law) extend into the uv?; (2) does the 2175 A absorption feature show polarization?; (3) in the far ultraviolet, does the polarization reflect the strong rise seen in the extinction curve? The results will provide vital new information about the composition and the size and shape distributions of the grains, and the nature of the carrier of the 2175 A feature. Targets are selected to have a variety of ultraviolet extinction and optical polarization properties, to enable us to examine whether the ultraviolet polarization is related to any of these.

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