Radial velocities of early-type stars in the Perseus OB2 association

We present radial velocities for 29 B- and A-type stars in the field of the nearby association Perseus OB2. The velocities are derived from spectra obtained with AURELIE, via cross correlation with radial velocity standards matched as closely as possible in spectral type. The resulting accuracy is similar to 2-3 km s(-1). We use these measurements, together with published values for a few other early-type stars, to study membership of the association. The mean radial velocity ( and measured velocity dispersion) of Per OB2 is 23.5 +/- 3.9 km s(-1), and lies similar to15 km s(-1) away from the mean velocity of the local disk field stars. We identify a number of interlopers in the list of possible late-B- and A-type members which was based on Hipparcos parallaxes and proper motions, and discuss the colour-magnitude diagram of the association.