Preprint Logo P33 November

To be published in:
Proceedings of the First XMM Workshop

X-ray spectroscopy with XMM:
A new powerful tool to determine fundamental parameters of early-type stars

R. Mewe1, G. Rauw2,*, K.A. van der Hucht1, J.-M. Vreux2, E. Gosset2,**, M. Guedel3, W. Schmutz4,
I.R. Stevens5 and S. Kahn6

1Space Research Organization Netherlands, Utrecht, The Netherlands
2 Institut d'Astrophysique et de Géophysique - Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
3ETHZ, Paul Scherrer Institute, Villigen, Switzerland
4ETH, Zürich, Switzerland
5School of Physics & Astronomy, Birmingham, United Kingdom
6Columbia Astrophysics Laboratory, USA

* Chargé de Recherches FNRS, Belgium
** Chercheur Qualifié FNRS, Belgium


     We briefly review the current knowledge on X-ray emission from hot massive stars based on previous X-ray missions and we highlight the potential of the instrumentation on board XMM to achieve considerable progress in this field. To this aim, we consider the WN7+abs star WR25 that exhibits one of the largest X-ray emission excesses known among (apparently) single Wolf-Rayet stars. High resolution XMM-RGS spectra of this star will enable us to constrain the abundances of several chemical elements that play a key role in massive star evolution but for which no accurate abundance determinations are available from longer wavelength observations.

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