XMM-Newton Observations of the Cataclysmic Variable GW Lib

Abstract

XMM-Newton observations of the accreting, pulsating white dwarf in the quiescent dwarf nova GW Librae were conducted to determine if the non-radial pulsations present in previous UV and optical data affect the X-ray emission. The non-radial pulsations are evident in the simultaneous Optical Monitor data but are not detected in X-ray with an upper limit on the pulsation amplitude of 0.092 mags. The best fits to the X-ray spectrum are with a low temperature diffuse gas model or a multi-temperature cooling flow model, with a strong OVIII line, similar to other short period dwarf novae, but with a lower temperature range than evident in normal short period dwarf novae. The lack of pulsations and the spectrum likely indicate that the boundary layer does not extend to the surface of the white dwarf.

16 pages, 4 figures; accepted for publication in AJ

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• Swift observations of GW Lib: a unique insight into a rare outburst
• GW Librae: A unique laboratory for pulsations in an accreting white dwarf
• Spectroscopic Observations of the WZ Sge-Type Dwarf Nova GW Librae during the 2007 Superoutburst
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• Superhumps linked to X-ray emission. The superoutbursts of SSS J122221.7-311525 and GW Lib
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