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Astron. Astrophys. 364, 665-673 (2000)

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Accurate masses of very low mass stars

III. 16 new or improved masses * **

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

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

Received 21 July 2000 / Accepted 28 September 2000

Abstract

We have obtained adaptive optics images and accurate radial velocities for 7 very low mass objects, In the course of a long term effort to determine accurate masses for very low mass stars (M[FORMULA]0.6 [FORMULA]). We use the new data, together with measurements from the litterature for some stars, to determine new or improved orbits for these 7 systems. They provide masses for 16 very low mass stars with accuracies that range between 0.2% and 5%, and in some cases a very accurate distance as well. This information is used in a companion paper to discuss the Mass-Luminosity relation for the V, J, H and K photometric bands.

Key words: stars: binaries: general – stars: binaries: spectroscopic – stars: binaries: visual – stars: low-mass, brown dwarfs – techniques: radial velocities – 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.
** Tables 4-15 are available only in electronic form at the CDS via anonymous ftp to ftp://cdsarc.u-strasbg.fr/pub/J/A+A/364/665 (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/364/665

Send offprint requests to: Damien Ségransan (segransa@obs.ujf-grenoble.fr)

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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