Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-07
Mon.Not.Roy.Astron.Soc. 316 (2000) 225
Astronomy and Astrophysics
Astrophysics
9 pages, accepted for publication in MNRAS 2 March 2000
Scientific paper
10.1046/j.1365-8711.2000.03507.x
We present simultaneous optical polarimetry and X-ray data of the near synchronous polar RX J2115-5840. We model the polarisation data using the Stokes imaging technique of Potter et al. We find that the data are best modelled using a relatively high binary inclination and a small angle between the magnetic and spin axes. We find that for all spin-orbit beat phases, a significant proportion of the accretion flow is directed onto the lower hemisphere of the white dwarf, producing negative circular polarisation. Only for a small fraction of the beat cycle is a proportion of the flow directed onto the upper hemisphere. However, the accretion flow never occurs near the upper magnetic pole, whatever the orientation of the magnetic poles. This indicates the presence of a non-dipole field with the field strength at the upper pole significantly higher. We find that the brightest parts of the hard X-ray emitting region and the cyclotron region are closely coincident.
Buckley David A. H.
Cropper Mark
Harrop-Allin Margaret K.
Potter Stephen
Ramsay Gavin
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