XMM-newton high-resolution x-ray - spectroscopy of wr 25

We report the analysis of the first high-resolution X-ray spectra of the WN6ha star WR 25 (HD 93162) obtained with the reflection grating spectrometers (rgs) and the european photon imaging cameras (epic- mos and -pn) ccd spectrometers on board XMM-Newton. The spec- trum exhibits bright emission lines of the H- and He-like ions of Ne, Mg, Si and S, as well as lines of Fe xvii to Fe xx and Fe xxv. Line fluxes have been determined. The rgs and epic spectra have been simultane- ously fitted to obtain self-consistent temperatures, emission measures, and elemental abundances. Multi-temperature fitting yields two dom- inant components around temperatures of 7 and 30 MK, respectively. An interstellar absorption value, related to the optically thick wind of the WR star is obtaines as NH in the range 3-6 1021 cm-2 . The pres- ence of the Fe xxv emission-line complex at6.7 keV is argued as being indicative for colliding winds inside the WR+O binary system.