We have compiled a list of 36 O+O and 89 Wolf-Rayet binary candidates in the Milky Way and Magellanic clouds detected with the Chandra , XMM-Newton and ROSAT satellites to probe the connection between their X-ray properties and their system characteristics .
Of the WR binaries with published parameters , all but two have kT > 0.9 keV .
The most X-ray luminous WR 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 WR primaries .
Among the O+O binaries , short-period systems generally have soft X-ray spectra and longer period systems show harder X-ray spectra again with a large spread in L _ { X } / L _ { bol } .