Radial velocities of early-type stars in the Perseus OB2 association K. C. Steenbrugge, J. H. J. de Bruijne, R. Hoogerwerf and P. T. de Zeeuw A&A, 402 2 (2003) 587-605 Published online: 14 April 2003 DOI: 10.1051/0004-6361:20030277