Volume 446, Number 2, February I 2006
|Page(s)||733 - 738|
|Section||Celestial mechanics and astrometry|
|Published online||13 January 2006|
On the dynamics of the AB Doradus system
Departamento de Astronomía y Astrofísica, Universidad de Valencia, 46100 Burjassot, Valencia, Spain e-mail: email@example.com
2 Steward Observatory, University of Arizona, Tucson, Arizona 85721, USA
3 Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
4 Observatoire de Paris/LERMA, Rue de l'Observatoire 61, 75014 Paris, France
5 Australian Telescope National Facility, P.O. Box 76, Epping, NSW 2121, Australia
6 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Accepted: 21 September 2005
We present an astrometric analysis of the binary systems AB Dor A /AB Dor C and AB Dor Ba /AB Dor Bb. These two systems of well-known late-type stars are gravitationally associated and they constitute the quadruple AB Doradus system. From the astrometric data available at different wavelengths, we report: (i) a determination of the orbit of AB Dor C, the very low mass companion to AB Dor A, which confirms the mass estimate of 0.090 reported in previous works; (ii) a measurement of the parallax of AB Dor Ba, which unambiguously confirms the long-suspected physical association between this star and AB Dor A; and (iii) evidence of orbital motion of AB Dor Ba around AB Dor A, which places an upper bound of 0.4 on the mass of the pair AB Dor Ba /AB Dor Bb (50% probability). Further astrometric monitoring of the system at all possible wavelengths would determine with extraordinary precision the dynamical mass of its four components.
Key words: astrometry / stars: kinematics / stars: binaries: close / stars: late-type / stars: individual: Rst 137 B / stars: individual: AB Dor
© ESO, 2006
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