Volume 530, June 2011
|Number of page(s)||7|
|Section||Stellar structure and evolution|
|Published online||23 May 2011|
XMM-Newton observations of the pre-polar HS0922+1333
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
Received: 24 June 2010
Accepted: 19 April 2011
We report on XMM-Newton and accompanying phase-resolved optical observations of HS0922+1333, one out of nine pre-polars. It shows X-ray and UV variability correlated with the visibility of the main accretion spot. The spectral X-ray properties reveal a low temperature thermal plasma of ~1 keV with FX more than one order of magnitude below the cyclotron flux. The UV data indicate a cool white dwarf with TWD < 8000 K. We refine the ephemeris and determine a distance of 140 ± 50 pc. The derived location of the accretion spots yield a magnetic field axis laying nearly in the orbital plane. Optical spectroscopy uncovers a highly active secondary.
Key words: binaries: close / X-rays: binaries / novae / cataclysmic variables
© ESO, 2011
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