The young open cluster around the hot star lambda Orionis

We propose to observe the young (26 Myr) open cluster around the hot (O8III)star lambda Orionis. We will obtain a highresolution spectrum of the centralhot star with RGS as well as EPIC imaging and spectra of the surroundingcluster. Our goal is to study the Xray properties of the lambda Ori wind and ofpremain sequence cluster members, and to compare them with those of the twinsigma Ori cluster, in order to investigate the influence of the ambientenvironment on stellar evolution and activity. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]