XMM-Newton observations of the pre-polar HS0922+1333

Details XMM-Newton observations of the pre-polar HS0922+1333 XMM-Newton observations of the pre-polar HS0922+1333

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...530a.117v&link_type=abstract

Astronomy & Astrophysics, Volume 530, id.A117

Astronomy and Astrophysics

Astrophysics

2

Binaries: Close, X-Rays: Binaries, Novae, Cataclysmic Variables

Scientific paper

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.

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