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Ultraviolet and Visible Spectropolarimetry of the Red Rectangle and HD 44179
We present the first ultraviolet and visible spectropolarimetry of thebiconical nebula the Red Rectangle and its associated binary HD 44179.These observations were made between 1992 November and 1995 Novemberusing the Faint Object Spectrograph on board the Hubble Space Telescopeand two separate ground-based observations. These new data gives moreclues to the geometrical picture of the region. Previous results havetypically reported linear polarizations in the visible and infrared of1%--2%. We present results that clearly show an increase in thecontinuum polarization shortward of 2000 A into the 10%--15% range. Inaddition, the position angle is seen to rotate by 65 deg in the samewavelength region, probably a result of the bipolar geometry and theexistence of an optically thick equatorial disk. It is also seen thatlines due to Mg II absorption, H alpha emission, and several lines dueto CO are polarized differently than the continuum. There also appear tobe features attributable to OH, which would be extremely unusualconsidering the assumed carbon-rich atmosphere that is present.
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