Rotational velocities for 26 stars in the Orion Nebula cluster show: (i) the unusually low mean rotational velocity for the early B stars that is a characteristic of the Orion association, (11) higher rotational velocities for the middle and late B stars than in the association, and (ill) very high rotational velocities among A stars relative to similar field stars. it is not known whether the high rotational velocities are a peculiarity of the Orion stars or a characteristic of all B- and A-type stars that have recently arrived on the main sequence.
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Abt et al. (1970) studied this question.