GT Observations of Hot Stars: WR 25

GTWR25, WN7+abs, exhibits the largest Xray luminosity among WolfRayet stars,suggesting a longperiod collidingwind binary system. XMMRGS spectra willyield chemical abundances of the WR stellar wind and test evolutionary models. Three pointings of 30 ksec each will provide evidence on the Xray variabilityof WR25, and information on the variability of the nearby binary HD93205 of typeO3V+O8V with P6.08 days. XMMEPIC spectra will be obtained at crucial orbitalphases of HD93205, in order study dynamical properties of the component winds.This is a joint program of the XMMRGS and XMMOM instrument teams. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]