GT Observations of Hot Stars: Gamma2 Vel

GTGamma Vel is an earlytype binary consisting of an O9 supergiant and aWolfRayet star. Both stars have a powerful wind and the resulting collisionzone is a strong Xray source. We plan to explore the physical conditions andelemental abundances as well as the dynamics in this interaction region.Comparison with stateofthe art hydrodynamical models will provide a stringentcheck on the model input physics. Observations at maximum and minimum phase willreveal varying absorption columns and hence constraints on the mass loss rateand abundance patterns in the WR wind. Two phasecritical observations will beperformed: i) 30 ks during the Xray maximum, ii) 65 ks during the low state.The pn will be used in full window/thick filter mode, and both MOS in window2/thick filter mode. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]