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To be published in:
Proc. Symp. 'New Visions of the X-ray Universe in the XMM-Newton and Chandra Era', ESA SP-488, eds. F. Jansen et al.

Monitoring the wind interaction in HD93403 with XMM-Newton.

G. Rauw1, J.-M. vreux1, I.I. Antokhin1, I.R. Stevens2,1, E. Gosset1,*, H. Sana1,**, C. Jamar3 and K.O. Mason4

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium
2 School of Physics & Astronomy, University of Birmingham, Edgbaston Birmingham B15 2TT, United Kingdom
3 Centre Spatial de Liège, Université de Liège, Avenue du Pré-Aily, B-4031 Angleur, Belgium
4 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, United Kingdom

* Research Associate FNRS, Belgium
** Research Fellow FNRS, Belgium


     We report the first results of a campaign aimed at the study of early-type binaries with the XMM-Newton observatory. Phase resolved EPIC spectroscopy of the eccentric binary HD93403 reveals a clear modulation of the X-ray flux as a function of the orbital phase. We find that the variations of the EPIC count rates in the 1.0 - 2.5 keV band are consistent with a colliding wind scenario.
Beside some diffuse emission from the Carina Nebula, the EPIC images centered on HD93403 reveal also X-ray emission from the open cluster Trumpler 15 as well as a number of discrete sources. We briefly discuss the properties of one of these sources.

Key Words
binaries: close -- stars: early-type stars: individual: HD93043 -- stars: winds, outflows, -- X-rays: stars

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