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Contact: Francis Reddy
NASA/Goddard Space Flight Center

2 O Stars Bound Together in the Same Binary System: Cygnus Ob2 #9

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Caption: O-type stars are among the most massive and hottest known, pounding their surroundings with intense ultraviolet light and powerful outflows called stellar winds. NASA's Swift and ESA's XMM-Newton X-ray observatories took part in a 2011 campaign to monitor the interaction of two O stars bound together in the same binary system: Cygnus OB2 #9.

Credit: Credit: NASA's Goddard Space Flight Center

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Related news release: X-ray satellites monitor the clashing winds of a colossal binary

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