The origin of X-rays in the progenitors of polars

Physics

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White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Hs0922+1333, Xmm-Newton Proposal 05060801

Scientific paper

We propose to observe HS0922+1333, one of the rare progenitors of normal polars, accreting from the stellar wind of the companion star. Due to the extremely low accretion rate they enable us to observe crucial details of accretion physics which are not accessible in polars already accreting via Roche-lobe overflow. The special geometry of HS0922 also provides the opportunity to get an undisturbed view of the companion star in X-rays, and may thus give a clue to the question of the secondaries being comparable to single active late type stars. HS0922 is therefore an exceptional target for verifying the current models of the accretion regions on compact stars, of magnetic activity on fastly rotating late-type stars, and of binary evolution.

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