AAS 203rd Meeting, January 2004
Session 44 Cataclysmic Variables, Novae
Poster, Tuesday, January 6, 2004, 9:20am-6:30pm, Grand Hall

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[44.11] An XMM-Newton Observation of UX Ursae Majoris: A Two-Component X-ray Emission

K. Mukai (NASA/GSFC & USRA), G.W. Pratt (CEA/Saclay), B.J.M. Hassall (UCLAN), T. Naylor (Exeter), J.H. Wood (Keele)

In the optical and ultraviolet regions of the electromagnetic spectrum, UX Ursae Majoris is a deeply eclipsing cataclysmic variable. However, it has shown no soft X-ray eclipse in ROSAT observations. We have obtained a 50 ksec XMM-Newton observation to further constrain the origin of the X-rays. We find two components in the X-ray emission of UX UMa. The soft component, dominant below photon energy of 2 keV, can be fit with a multi-temperature plasma model and is uneclipsed. The hard component, dominant above 3 keV, can be fit with a kT~5 keV plasma model and appears to be deeply eclipsed. We consider the possible origins of these components.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.