BeppoSAX observations of the long period polar system V1309 Ori

Details BeppoSAX observations of the long period polar system V1309 Ori BeppoSAX observations of the long period polar system V1309 Ori

1998-02-19

arxiv.org/abs/astro-ph/9802254v1

Astronomy and Astrophysics

Astrophysics

6 pages A&A-Latex, 3 Figures, accepted for publication in A&A

Scientific paper

We present BeppoSAX observations of the peculiar long period polar system V1309 Ori (RXJ0515.6+0105). The source was detected simultaneously at soft and, for the first time, at hard X-rays with the LECS and the MECS detectors. Both, the LECS and the MECS light curves are irregular with a bursting/flaring type behaviour indicating inhomogeneous accretion onto the white dwarf. This peculiar variability, together with an extreme high soft-to-hard X-ray luminosity ratio, indicates that in V1309 Ori accretion occurs predominantly in highly compressed chunks or ``blobs'' of matter. From coordinated ESO optical spectroscopy, we find indications that the magnetic field strength of the white dwarf is < 70 MG, not expected either from the 8 hr orbital period synchronism or from the strong soft-to-hard X-ray ratio suggesting alternative solutions for sustaining synchronism in this system.

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