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First science results from the High Speed SAAO Photo-polarimeter

Potter, S.; Buckley, D. A. H.; O'Donoghue, D.; O'Connor, J.; Fourie, P.; Evans, G.; Sass, C.; Crause, L.; Butters, O. W.; Norton, A. J.; Mukai, K. and Still, M. (2011). First science results from the High Speed SAAO Photo-polarimeter. In: Astronomical Polarimetry 2008: Science from Small to Large Telescopes, 6-11 Jul 2008, Fairmont Le Manoir Richelieu, La Malbaie, Quebec, Canada.

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Abstract

We report on the completion of a new 2 channel, HIgh speed Photo-POlarimeter (HIPPO) to be used on the 1.9 m optical telescope of the South African Astronomical Observatory. The instrument makes use of rapidly counter-rotating (10 Hz), super-achromatic half and quarter wave-plates, a fixed Glan-Thompson beamsplitter and two photo-multiplier tubes that record the modulated O and E beams. Each modulated beam permits an independent measurement of the polarization and therefore the capability of simultaneous 2 filter observations. All Stokes parameters are recorded every 0.1 s and photometry every 1 ms. Post-binning of data is possible in order to improve the signal. This is ideal for measuring, e.g., the rapid variability of the optical polarization from magnetic Cataclysmic Variable stars (mCVs). We will present our first science results made in February 2008. Specifically the discovery of short quasi-periodic (~ 3–5 minutes) variations in the circular polarized emissions from the recently discovered mCV candidate IGRJ14536-5522.

Item Type: Conference or Workshop Item
Copyright Holders: 2011 Astronomical Society of the Pacific
Extra Information: Astronomical Polarimetry 2008: Science from Small to Large Telescopes
Proceedings of a workshop held at Fairmont Le Manoir Richelieu, La Malbaie, Quebec, Canada
6-11 July 2008
Edited by Pierre Bastien, Nadine Manset, Dan P. Clemens,
Nicole St-Louis,
ASP Conference Series, Vol. 449,
ISBN: 978-1-58381-780-3
e-book ISBN: 978-1-58381-781-0
pp.27-31
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Related URLs:
Item ID: 33637
Depositing User: Andrew Norton
Date Deposited: 10 May 2012 10:01
Last Modified: 12 Jun 2020 15:23
URI: http://oro.open.ac.uk/id/eprint/33637
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