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To be published in:
Massive Stars: Formation, Evolution, Internal Structure and Environnement, eds. M. Heydari-Malayeri and J.-P. Zahn

Massive Binaries and Colliding Winds

G. Rauw1,*

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium

* Research Associate FNRS, Belgium


     In this contribution, I review recent results from observational investigations of early-type binaries of spectral types O and Wolf-Rayet. These studies aim at an accurate determination of fundamental parameters such as masses and radii of the most massive stars. In addition, multi-wavelength analyses of wind collisions in massive binaries provide constraints on the properties of stellar winds of massive stars and shock physics of cosmic plasmas.

Key Words
binaries: spectroscopic -- stars: early-type -- stars: fundamental parameters

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