Simon Kissling 1, Elie Talon Louokdom 2,*, Frédéric Biya-Motto 2, Bernard Essimbi Zobo 2 and Mauro Carpita 3 1 Development of Power Electronics Systems (DEPsys), Route du Verney 20B, 1070 Puidoux, Switzerland; [email protected] 2 Laboratory of Electronics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon; [email protected] (F.B.-M.); be...

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Hipparcos data provide the rst, volume limited and absolute magnitude limited homogeneous tracer of stellar density and velocity distributions in the solar neighbourhood. The density of A-type stars more luminous than M v = 2:5 can be accurately mapped within a sphere of 125 pc radius, while proper motions in galactic latitude provide the vertical velocity distribution near the galactic plane. ...