Rotational Velocities of Low-Mass Stars in the Pleiades and Hyades

We have obtained high-resolution spectra of 89 M dwarf members of the Pleiades and Hyades and have derived radial velocities, Hα equivalent widths, and spectroscopic rotational velocities for these stars. Typical masses of the newly observed Pleiades and Hyades stars are ∼0.4 M⊙ and ∼0.2 M⊙, respectively. We combine our new observations with previously published data to explore the rotational evolution of young stars with M ≤ 0.4 M⊙. The …