Marc Gagne, Garrett Fehon, Michael Savoy, Carlos Cartagena, David H. Cohen, Stanley P. Owocki
We have compiled a list of 35 O+O binaries and 86 Wolf-Rayet binaries in the Milky Way and Magellanic clouds detected with the {\it Chandra}, {\it XMM-Newton} and {\it ROSAT} satellites to probe the connection between their X-ray properties % ($L_{\rm X}$, $L_{\rm X}/L_{\rm bol}$ and $kT$) and their system characteristics. Of the Wolf-Rayet binaries with published model parameters, all have log LX > 32, kT > 1 keV and log Lx/Lbol > -7. The most X-ray luminous W-R binaries are typically very long period systems. The WR binaries show a nearly four-order of magnitude spread in X-ray luminosity, even among among systems with very similar W-R primaries. Among the O+O binaries, short-period systems have soft X-ray spectra and longer period systems show harder X-ray spectra again with a large spread in Lx/Lbol.
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http://arxiv.org/abs/1205.3510
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