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Ultraviolet Interstellar Linear Polarization. III. Features
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BibTeX
@MISC{Wolff_ultravioletinterstellar,
author = {Michael Wolff and Geoffrey C. Clayton and Sang-hee Kim and P. G. Martin and Christopher M. Anderson},
title = {Ultraviolet Interstellar Linear Polarization. III. Features},
year = {}
}
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Abstract
Astro-2 has revealed a broad weak spectral feature in the ultraviolet interstellar linear polarization for two lines of sight, confirming the original detection toward HD 197770 and adding HD 147933-4. These are the only two polarization features found in some 30 lines of sight now observed. Both features are centered close to 2175 A, the position of the ubiquitous ultraviolet extinction bump. Two possibilities are considered for the source of the polarization feature: changes in the mass distribution of the aligned silicate grains responsible for the continuum polarization and alignment of the small graphite grains responsible for the extinction bump. While the former approach meets with some success for the HD 197770 feature, it is not possible to produce a feature as clearly peaked as in HD 147933-4. The central wavenumbers and widths of both polarization features correspond closely to those of the corresponding extinction bump. Taken together, it seems the graphite grains are a mor...
Keyphrases
ultraviolet interstellar linear polarization polarization feature former approach meet corresponding extinction bump central wavenumbers original detection aligned silicate grain ubiquitous ultraviolet extinction bump graphite grain continuum polarization mass distribution extinction bump broad weak spectral feature small graphite grain
