Volume 406, Number 1, July IV 2003
|Page(s)||293 - 298|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
Visual orbit for the low-mass binary Gliese 22 AC from speckle interferometry*
Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
2 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3 Observatorio Astronómico Ramón María Aller, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782 Santiago de Compostela, Spain
Corresponding author: J. Woitas, firstname.lastname@example.org
Accepted: 15 May 2003
Based on 14 data points obtained with near-infrared speckle interferometry and covering an almost entire revolution, we present a first visual orbit for the low-mass binary system Gliese 22 AC. The quality of the orbit is largely improved with respect to previous astrometric solutions. The dynamical system mass is , where the largest part of the error is due to the Hipparcos parallax. A comparison of this dynamical mass with mass-luminosity relations on the lower main sequence and theoretical evolutionary models for low-mass objects shows that both probably underestimate the masses of M dwarfs. A mass estimate for the companion Gliese 22 C indicates that this object is a very low-mass star with a mass close to the hydrogen burning mass limit.
Key words: stars: individual: Gliese 22 / stars: binaries: visual / stars: low-mass, brown dwarfs / techniques: high angular resolution
© ESO, 2003
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