Author/Authors :
Christine Ducourant، نويسنده , , Sylvain Bontemps، نويسنده , , Didier Despois، نويسنده , , Philippe Andre، نويسنده , , Ramachrisna Teixeira، نويسنده , , Estelle Moraux، نويسنده , , Jerome Bouvier، نويسنده , , Alberto Krone، نويسنده , , Martins and Dimitris Sinachopoulos، نويسنده ,
Abstract :
We present a proper-motion program that we have developed at ESO to measure, for the first time, proper motions of members of the nearby (125 pc), very young (4 x 105 yr) infrared p Ophiuchi cluster. Repeated imaging over an extended period will allow us to measure the global proper motion of the cluster and its velocity dispersion and will provide access to the ~ 1 km s_1 velocities for objects as faint as K = 15.7 mag. Access to the velocity field of such an extremely young cluster is of crucial importance to investigate the origin and early evolution of open cluster systems.
Keywords :
stars: distances , stars: kinematics , stars: evolution , stars: formation
