Fig. 9

Continuum polarization for a polarized standard star HD 30657 observed on January 10th 2013. In Whittet et al. 1992 this star is quoted to have an R-band linear polarization of 3.72%. Stokes q is shown in red, u in green, v in blue and the total degree of polarization in black. The colored symbols show the spectrum rebinned to 20 points per spectral order to highlight noise levels and any order edge mismatches. The solid colored lines show the spectra plotted with one point per spectral order. The telescope induced polarization and associated continuum errors have been removed from this measurement using an unpolarized standard star observed at a nearby pointing. Observations were recorded from 11:48 to 12:46. The telescope pointing varied from elevation, azimuth of (35, 291) to (22, 294). Two sets were recorded with 300 shuffles per exposure and a 1 Hz modulation frequency. This corresponds to 300 s per beam, four beams per exposure with a total of three exposures.
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