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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 ,
Sylvain Bontemps ,
Didier Despois ,
Philippe André ,
Ramachrisna Teixeira ,
Estelle Moraux ,
Jerome Bouvier ,
Alberto Krone–Martins  and
Dimitris Sinachopoulos
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
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Abstract

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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.

Keywords

stars: distancesstars: kinematicsstars: evolutionstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 386 - 389
Copyright
Copyright © International Astronomical Union 2010

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