a Critical Extension of the Interstellar Polarization Curve: CYCLE3HIGH

Details a Critical Extension of the Interstellar Polarization Curve: CYCLE3HIGH a Critical Extension of the Interstellar Polarization Curve: CYCLE3HIGH

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4305c&link_type=abstract

HST Proposal ID #4305

Physics

Hst Proposal Id #4305

Scientific paper

WUPPE obtained the first ultraviolet spectropolarimetric observations which provided data on the wavelength dependence of interstellar polarization along 8 lines of sight. The data reveal three distinct UV wavelength dependences: Serkowski, super-Serkowski, and a bump at 2175 A. The behavior of the UV polarization seems to be correlated to Lambda-max. Wolff et al. (1993) use the WUPPE data to re-examine four grain models used to fit the extinction and polarization in the visible and IR. Stringent constraints are placed upon models by the necessity of reproducing both Serkowski and super-Serkowski behavior. In fact, the UV polarimetry allowed Wolff et al. to identify non-physical aspects of several grain models, and to obtain information about grain morphology and environments. However, the observed sample suffers from selection bias. All but one of the objects fall into a narrow band of Lambda-max, critically under sampling the observed range. We propose to add an extreme Lambda-max sightline to the existing sample. This will provide a double impact: 1) verification of the Lambda-max/UV behavior trend and 2) key insight into the physical nature of grains and their environments. HST is uniquely suited to provide these data and Cycle 3 is the last opportunity to do polarimetry with HST. One consequence of the installation of COSTAR will be the permanent loss of HST's polarimetric capabilities.

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