The Projected Rotational Velocity Distribution of a Sample of OB stars from a Calibration based on Synthetic He I lines

S. Daflon, K. Cunha, F. X. de Araujo +2

We derive projected rotational velocities (vsini) for a sample of 156 Galactic OB star members of 35 clusters, HII regions, and associations. The HeI lines at $\lambda \lambda$4026, 4388, and 4…