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Ultraviolet interstellar polarization observed with the Hubble Space Telescope

1994; IOP Publishing; Volume: 427; Linguagem: Inglês

10.1086/187361

1538-4357

W. B. Somerville, Richard G. Allen, D. J. Carnochan, Lida He, D. McNally, P. G. Martin, D. H. Morgan, K. Nandy, J. R. Walsh, D. C. B. Whittet, R. Wilson, M. J. Wolff,

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view Abstract Citations (34) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Interstellar Polarization Observed with the Hubble Space Telescope Somerville, W. B. ; Allen, R. G. ; Carnochan, D. J. ; He, Lida ; McNally, D. ; Martin, P. G. ; Morgan, D. H. ; Nandy, K. ; Walsh, J. R. ; Whittet, D. C. B. ; Wilson, R. ; Wolff, M. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1994 DOI: 10.1086/187361 Bibcode: 1994ApJ...427L..47S Keywords: 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; Astronomy; ISM: DUST; EXTINCTION; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 7252; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 161056; TECHNIQUES: POLARIMETRIC; ULTRAVIOLET: ISM full text sources ADS | data products SIMBAD (5) MAST (2) ESA (1)