Ultraviolet interstellar polarization observed with the Hubble Space Telescope

Details Ultraviolet interstellar polarization observed with the Hubble Space Telescope Ultraviolet interstellar polarization observed with the Hubble Space Telescope

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..47s&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 427, no. 1, p. L47-L50

Astronomy and Astrophysics

Astronomy

25

Absorption Spectra, Astronomical Photometry, Astronomical Polarimetry, Cosmic Dust, Interstellar Extinction, Interstellar Matter, Polarization (Waves), Ultraviolet Astronomy, Hubble Space Telescope, Pipelines, Polarimeters, Spectrophotometers, Spectroscopic Telescopes, Ultraviolet Spectrometers

Scientific paper

We have used the Faint Object Spectrograph of the Hubble Space Telescope to observe interstellar linear polarization from 1300 to 3300 A in two stars with well-studied interstellar polarization at visible wavelenths. The wavelength dependence of linear polarization declines smoothly with decreasing wavelength and is devoid of structure associated with the prominent 2175 A absorption bump in the interstellar extinction curve. The data for one star (HD 161056) are consistent with an extrapolation based on the Serkowski formula of a fit to the ground-based polariztion; the other star (HD 7252) shows excess (super-Serkowski) polarization relative to the extrapolation. Out of a total of 10 stars now studied by means of spectropolarimetry in the satellite ultraviolet, including eight obseved with the Wisconsin Ultraviolet Photopolarimeter, five (those of longest lambda max) show Serkowski behavior, and four others show super-Serkowski behavior; only one (HD 197770) shows evidence for polarization associated with the 2175 A bump. These results place important constraints on the nature of the bump feature.

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