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Massive stars are often found with nearby companion stars. The closer companions are detected as spectroscopic binaries through measurements of orbital Doppler shifts. However, a number of high angular resolution techniques are now available to discover the wider binaries. I will review the results from several high angular resolution studies of the massive O-type stars including a second epoch, speckle interferometric survey and an adaptive optics and Hubble Space Telescope survey of the very massive stars in the relatively nearby Cyg OB2 association.
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