GT Observations of Hot Stars: Zeta Ori

GTzeta Ori, a late O type supergiant, is a strong Xray source. The Xraysoriginate from shocks in the stellar wind. The observations will be used toestablish the physical conditions and elemental abundances in the shockedmaterial. With models of line transfer in moving atmospheres we will determinethe volume filling factor and depth distribution of the shocked gas pockets.This will help to constrain the still unknown mechanism that triggers theseshocks. zeta Ori will be in the RGS focus. The surrounding field is a starformation region with many Xray sources. We will use the EPIC cameras to studythis complete field as well. The pn will be used in full window mode, one MOSwith window2 and the other MOS in timing mode. All EPICs will use the thick filter. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]