XMM-Newton Observations of the Dwarf Nova VW Hyi

Details XMM-Newton Observations of the Dwarf Nova VW Hyi XMM-Newton Observations of the Dwarf Nova VW Hyi

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.4605p&link_type=abstract

American Astronomical Society, HEAD meeting #7, #46.05; Bulletin of the American Astronomical Society, Vol. 35, p.657

Astronomy and Astrophysics

Astronomy

Scientific paper

We present our analysis of XMM-Newton data of the dwarf nova VW Hyi obtained during the quiescent state. The X-ray spectrum indicates that the boundary layer is an optically thin plasma with a continuous temperature distribution and a maximum temperature of ˜6 keV. The ratio of boundary layer to disk luminosity is fairly low at 0.2. We find that the boundary layer is rotating at a velocity of ˜600 km/s, which is similar to the white dwarf's rotation velocity. We detect a 60-s quasi-periodic X-ray oscillation that is possibly connected to the rotation of the boundary layer. A correlation is found between the X-ray and the ultra-violet variability with the X-rays being delayed by ˜100 s. An orbital modulation of the X-ray flux suggests a misalignment between the rotation axes of the white dwarf and the inner disk.

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