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Title:
A Hubble Space Telescope Advanced Camera for Surveys Search for Brown Dwarf Binaries in the Pleiades Open Cluster
Authors:
Bouy, H.; Moraux, E.; Bouvier, J.; Brandner, W.; Martín, E. L.; Allard, F.; Baraffe, I.; Fernández, M.
Affiliation:
AA(Instituto de Astrofísica de Canarias, Vía Láctea, S/n, E-38200 La Laguna, Tenerife, Spain; ), AB(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; ), AC(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 Rue de la Piscine, F-38400 Saint Martin d'Hère, France; ), AD(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; ), AE(Instituto de Astrofísica de Canarias, Vía Láctea, S/n, E-38200 La Laguna, Tenerife, Spain; and Department of Physics, University of Central Florida, P.O. Box 162385, Orlando, FL 32816-2385 ), AF(Centre de Recherche Astronomique de Lyon (UML 5574), Ecole Normale Supérieure, 69364 Lyon Cedex 07, France; , ), AG(Centre de Recherche Astronomique de Lyon (UML 5574), Ecole Normale Supérieure, 69364 Lyon Cedex 07, France; , ), AH(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; )
Publication:
The Astrophysical Journal, Volume 637, Issue 2, pp. 1056-1066. (ApJ Homepage)
Publication Date:
02/2006
Origin:
UCP
ApJ Keywords:
Stars: Binaries: General, Galaxy: Globular Clusters: General, globular clusters: individual (M45), globular clusters: individual (Pleiades), Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function
DOI:
10.1086/498350
Bibliographic Code:
2006ApJ...637.1056B

Abstract

We present the results of a high-resolution imaging survey for brown dwarf binaries in the Pleiades open cluster. The observations were carried out with the Advanced Camera for Surveys (Pavlovsky and coworkers) on board the Hubble Space Telescope. Our sample consists of 15 bona fide brown dwarfs. We confirm two binaries and detect their orbital motion, but we did not resolve any new binary candidates in the separation range between 5.4 and 1700 AU and masses in the range 0.035-0.065 Msolar. Together with the results of our previous study (Martín and coworkers), we can derive a visual binary frequency of 13.3+13.7-4.3% for separations greater than 7 AU, masses in the range 0.055-0.065 Msolar, and mass ratios in the range 0.45-0.9<q<1.0. The other observed properties of Pleiades brown dwarf binaries (distributions of separation and mass ratio) appear to be similar to their older counterparts in the field.
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