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Searching for Colliding Wind Signatures in a Sample of O-Star Binaries+

G. Rauw1,*, H. Sana1, J.-M. vreux1, E. Gosset1,** and I.R. Stevens2

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
2 School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

* Postdoctoral Researcher FNRS, Belgium
** Research Associate FNRS, Belgium

+ Based on observations collected at the Observatoire de Haute Provence, the European Southern Observatory (La Silla, Chile) and the Cerro Tololo Inter-American Observatory (CTIO)


     We have selected a sample of O-star binaries that display a substancial EINSTEIN X-ray excess luminosity. This excess X-ray emission is usually considered to be an indication of a colliding wind phenomenon and these systems are therefore good candidates to search for the signature of such an interaction at other wavelengths. In this contribution, we discuss the results of our optical monitoring of two particular binary systems: HDE 228766 (O7.5 + O5.5) and HD 93403 (O5.5I + O7V).

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