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The dynamics of an extremely young cluster probed for the first time

Published online by Cambridge University Press:  18 January 2010

Christine Ducourant
Affiliation:
Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France email: ducourant@obs.u-bordeaux1.fr
Sylvain Bontemps
Affiliation:
Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France email: ducourant@obs.u-bordeaux1.fr
Didier Despois
Affiliation:
Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France email: ducourant@obs.u-bordeaux1.fr
Philippe André
Affiliation:
CEA, DSM, IRFU, Service d'Astrophysique, 91191 Gif-sur-Yvette, France; Laboratoire AIM, CEA/DSM – CNRS – Université Paris Diderot, IRFU/Service d'Astrophysique, CEA–Saclay, 91191 Gif-sur-Yvette, France
Ramachrisna Teixeira
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo, Brazil
Estelle Moraux
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414, Rue de la Piscine, Domaine Universitaire, BP 53, 38041 Grenoble Cedex 09, France
Jerome Bouvier
Affiliation:
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414, Rue de la Piscine, Domaine Universitaire, BP 53, 38041 Grenoble Cedex 09, France
Alberto Krone–Martins
Affiliation:
Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux, 2 rue de l'Observatoire, BP 89, F-33271 Floirac Cedex, France email: ducourant@obs.u-bordeaux1.fr Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo, Brazil
Dimitris Sinachopoulos
Affiliation:
National Observatory of Athens, P. O. Box 20048, Thissio 11810, Athens, Greece
Corresponding
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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 × 105 yr) infrared ρ 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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

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