AAS 199th meeting, Washington, DC, January 2002
Session 133. Variable Stars: Searchers, Data, Analysis
Display, Thursday, January 10, 2002, 9:20am-4:00pm, Exhibit Hall

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[133.13] A Search for Radio Emission from Galactic Supersoft X-ray Sources

R.N. Ogley (University of Keele), S. Chaty (The Open University), M. Crocker (Jodrell Bank Observatory), S.P.S. Eyres (University of Central Lancashire), M.A. Kenworthy (University of Arizona), A.M.S. Richards (Jodrell Bank Observatory), L.F. Rodriguez (UNAM), A.M. Stirling (University of Central Lancashire)

We have made a deep search for radio emission from all the northern hemisphere supersoft X-ray sources using the VLA and MERLIN telescopes, at 5 and 8.4 GHz. Three previously undetected sources: T Pyx, V1974 Cygni and RX J0019.8+2156 were imaged in quiescence using the VLA in order to search for any persistent emission. No radio emission was detected in any of the VLA fields down to a typical 1 sigma RMS noise of 20 uJy/beam, however, 17 new point sources were detected in the fields with 5 GHz fluxes between 100 and 1500 uJy giving an average 100 uJy-source density of around 200 per square degree. The persistent source AG Draconis was observed by MERLIN to provide a confirmation of previous VLA observations and to investigate the source at a higher resolution. The core is resolved at the milliarcsec scale into two components which have a combined flux of around 1 mJy. It is possible that we are detecting nebulosity which is becoming resolved out by the higher MERLIN resolution. We have investigated possible causes of radio emission from a wind environment, both directly from the secondary star, and also as a consequence of the high X-ray luminosity from the white dwarf. There is an order of magnitude discrepancy between observed and modelled values which can be explained by the uncertainty in fundamental quantities within these systems.

The author(s) of this abstract have provided an email address for comments about the abstract: rno@astro.keele.ac.uk

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