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We report the results of our study of the high-velocity (\approx160 km/s)runaway O star CPD-64 2731 and its associated horseshoe-shaped nebuladiscovered with the Wide-field Infrared Survey Explorer. Spectroscopicobservations with the Southern African Large Telescope and spectral analysisindicate that CPD-64 2731 is a fast-rotating main-sequence O5.5 star withenhanced surface nitrogen abundance. We derive a projected rotational velocityof \approx300 km/s which is extremely high for this spectral type. Itskinematic age of \approx6 Myr, assuming it was born near the Galactic plane,exceeds its age derived from single star models by a factor of two. Theseproperties suggest that CPD-64 2731 is a rejuvenated and spun-up binaryproduct. The geometry of the nebula and the almost central location of the starwithin it argue against a pure bow shock interpretation for the nebula.Instead, we suggest that the binary interaction happened recently, therebycreating the nebula, with a cavity blown by the current fast stellar wind. Thisinference is supported by our results of 2D numerical hydrodynamic modelling.

CPD-64 2731: a massive spun-up and rejuvenated high-velocity runaway star