Journal Article

Near-infrared polarimetry of the Red Rectangle

T. M. Gledhill, A. N. Witt, U. P. Vijh and C. J. Davis

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 3, pages 1217-1224
Published in print January 2009 | ISSN: 0035-8711
Published online January 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14124.x
Near-infrared polarimetry of the Red Rectangle

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Imaging polarimetry through J and H broad-band filters and a 3.4 μm narrow-band filter is used to highlight the regions of scattered light in the Red Rectangle. We find that the scattered light identifies the circumbinary dust component of the molecular disc seen in CO emission. This region also appears to be the origin of the recently discovered Blue Luminescence. We find that the degrees of polarization are consistent with the amorphous carbon dust model invoked by Men'shchikov. Spectropolarimetry from 1.4 to 2.5 μm confirms that the degree of polarization in the central arcsecond region is very low. This suggests that the central bicone seen in the near-infrared is predominantly due to emission from hot dust and/or from stochastically heated nanoparticles, rather than due to scattering by large grains.

Keywords: scattering; techniques: polarimetric; stars: AGB and post-AGB; circumstellar matter; stars: individual: HD 44179

Journal Article.  6076 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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