2620 20160701171708.0 ASTROimport-777 Zorec, J. 2007 Rotation in the ZAMS: Be and Bn stars We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the mass; 2) Bn stars having ZAMS rotational velocities higher than a given limit might become Be stars. Frémat, Y. Martayan, C. Cidale, L. S. Torres, A. F. Active OB-Stars: Laboratories for Stellare and Circumstellar Physics 361 2007 539 http://esoads.eso.org/abs/2007ASPC..361..539Z published in NONREF