Keck rotational velocities of the faintest Pleiades and Hyades members

We have derived rotational velocities of faint Pleiades and Hyades members from high resolution spectra obtained with the HIRES spectrograph on the Keck telescope. The stars observed span the mass where stilts become totally convective. We find no change in the character of the distribution of rotational velocities at this point, but instead a gradual trend of increasing rotational velocities. The range in rotational velocities al a given mass in the Pleiades decreases with decreasing mass, and the amount of spindown between Pleiades and Hyades age decreases with decreasing mass, We observe for two of our stars a broad Hn emission component. (C) 1996 American Astronomical Society.