AAS 206th Meeting, 29 May - 2 June 2005
Session 42 Dwarf Novae and Other Cataclysmic Variables
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[42.02] AR Ursae Majoris: A New Persistent Radio Emitter

C.L. Gray, P.A. Mason (University of Texas at El Paso)

We conducted a radio survey of 9 magnetic cataclysmic variable stars (MCVs) at the VLA in October 2003 with the aim of constraining models for radio emission mechanisms. All observations were conducted in the X-band. The first ever radio detection of AR Ursae Majoris, the MCV with the highest known magnetic field (230 MG), was found with a flux density of 0.422 0.060 Jy. A follow up, phase resolved, observation, using 15 minute integrations, was performed in September 2004. The total observation time covered slightly more than one orbital period (1.93 hr) of the binary. AR UMa was found to be a persistent radio emitter. For the September 2004 observation the average flux density was 0.734 0.095 Jy. We measured a flux density of up to 1.122 0.195 Jy. The source was detected during all but one of the 15 minute integrations. For that observation, we obtained an upper-limit of 0.082 Jy. We discuss possible causes and suggest specific locations for the radio emission. This research is supported by a Minority Access to Research Careers scholarship funded by the National Institute of Health.

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© 2005. The American Astronomical Soceity.