The origin of X-rays in the progenitors of polars

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 lowaccretion rate they enable us to observe crucial details of accretion physicswhich are not accessible in polars already accreting via Rochelobe overflow.The special geometry of HS0922 also provides the opportunity to get anundisturbed view of the companion star in Xrays, and may thus give a clue tothe question of the secondaries being comparable to single active late typestars. HS0922 is therefore an exceptional target for verifying the currentmodels of the accretion regions on compact stars, of magnetic activity on fastlyrotating latetype stars, and of binary evolution. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]