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Astron. Astrophys. 350, L39-L42 (1999)

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Letter to the Editor

Accurate masses of very low mass stars * **

II. The very low mass triple system Gl 866

X. Delfosse 1, T. Forveille 2, S. Udry 3, J.-L Beuzit 2,4, M. Mayor 3 and C. Perrier 2

1 Instituto de Astrofisica de Canarias, 38200 La Laguna, Tenerife, Canary Islands, Spain
2 Observatoire de Grenoble, 414 rue de la Piscine, Domaine Universitaire de St Martin d'Hères, 38041 Grenoble, France
3 Observatoire de Genève, 51 Ch des Maillettes, 1290 Sauverny, Switzerland
4 Canada-France-Hawaii Telescope Corporation, P.O. Box 1597, Kamuela, HI 96743, USA

Received 2 August 1999 / Accepted 19 September 1999


We present very accurate orbital parameters and mass measurements (2.4% accuracy) for the well known very low mass triple system Gl 866. We obtain first orbital elements for the short-period orbit and greatly improve the long period orbit. All three stars have masses close to 0.1 [FORMULA], and the system thus provides the strongest constraints to date on the mass-luminosity relation close to the brown dwarf limit.

Key words: stars: binaries: general – stars: binaries: spectroscopic – stars: binaries: visual – stars: low-mass, brown dwarfs – stars: late-type

* Based on observations made at the Observatoire de Haute Provence (CNRS), and at the CFH Telescope, operated by the NRCC, the CNRS and the University of Hawaii
** Table 3 is only avaliable electronically here with the On-Line publication

Send offprint requests to: Xavier Delfosse (delfosse@ll.iac.es)

© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999