Investigation of the Pleiades cluster. I : Radial velocities of corona stars

Coravel radial velocities of 83 stars ranging in spectral types from F5 to K0 selected from van Leeuwen's et al (1986) survey of the corona of the Pleiades show that only 56 are actually members. Six spectroscopic binaries among the members (11%) and two among the non-members have been found. The large extent (10°) of the cluster over the sky also induces a radial-velocity gradient from which a convergent point has been determined (α=+39°.60, δ=−47°.79). Since the cluster's depth is so large (23 pc), the width of the main sequence is increased (0.3 mag).