
doi: 10.1086/129610
The insertion of a simple, stationary, three-element filter in front of the Cassegrain spectrograph and image-tube scanner (ITS) of the Lick 120-inch telescope allows simultaneous measurement of the Stokes parameters as a flinction of wavelength across at least 2000 A. Resolution for linear polarization varies from 25 A at 3100 A to 175 A at 8000 A, while the instrumental polarization is less than 0.2%. Simultaneous sky subtraction, small slit, and online reduction of incoming data already achieved in the ITS system make this a useful spectropolarimetric device for faint objects. Key words: polarization - spectrophotometry
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