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eJAAVSO

Using XMM-Newton and Optical Photometry to Figure Out CVs

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Paula Szkody
Lee Homer

Department of Astronomy, University of Washington, Seattle, WA 98195

Arne A. Henden
AAVSO, 25 Birch Street, Cambridge, MA 02145

Presented at the 95th Spring Meeting of the AAVSO, May 5, 2006; received July 11, 2006; revised October 4, 2006; accepted October 4, 2006

Abstract
X-ray light curves from XMM-Newton combined with optical data from the satellite and ground-based observers provide distinctive shapes and periodicities that give information on the correct classification of cataclysmic variables. Our recent data on three SDSS sources with strong helium emission are used to identify a highly magnetic system (a polar), the spin of the white dwarf in an intermediate polar, and a typical disk accreting system.

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