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Astron. Astrophys. 364, 665-673 (2000)
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]](img1.gif)
0.6 ![[FORMULA]](img2.gif)
).
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)
Contents
- 1. Introduction
- 2. Observing program
- 3. Observations and data processing
- 3.1. Radial-velocity observations
- 3.2. Adaptive optics imaging
- 3.3. Parallaxes
- 4. Orbital elements and mass measurements
- 4.1. Orbital adjustment
- 4.2. Individual objects
- 4.2.1. Gl 234 (Ross 614)
- 4.2.2. YY Gem
- 4.2.3. GJ 2069A (CU Cnc)
- 4.2.4. Gl 644
- 4.2.5. Gl 747AB (Kui 90)
- 4.2.6. Gl 831
- 4.2.7. Gl 866
- 5. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001
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