Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sass...30..103c&link_type=abstract
The Society for Astronomical Sciences 30th Annual Symposium on Telescope Science. Held May 24-26, 2011 at Big Bear Lake, CA. Pu
Astronomy and Astrophysics
Astronomy
Scientific paper
In a previous paper, the author discussed the construction of an automated dual beam imaging polarimeter and of observations made in the November 2009 to February 2010 period. Here, we discuss observations and instrumental improvements that span the period from late August 2010 through third and into fourth contacts in Spring 2011. Approximately 930 linear polarization measurements of the target star in BVR bands were obtained during 99 nights of observation. Additional measurements were made of both known polarization standards and zero polarization stars to verify instrument calibration. The polarization of Epsilon Aurigae was observed to vary by nearly 0.4% peak to valley during this period. These variations occurred in several major cycles of varying duration. Measurement error is estimated to be on the order of +/-0.05%. The observed variations resemble excess polarization seen during the 1984 eclipse egress, but may show some differences in detail. During this project, a new optical rotator was developed in conjunction with Optec, Inc., and used for the last two months of observations. This project was initiated at the suggestion of Dr. Robert Stencel at the May 2009 SAS meeting to extend measurements done during the 1984 eclipse by Dr. Jack Kemp and followed up by his student, Dr. Gary Henson thereafter.
Cole Gary M.
Stencel Robert E.
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