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Issue A&A
Volume 446, Number 2, February I 2006
Page(s) 733 - 738
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20053757

A&A 446, 733-738 (2006)
DOI: 10.1051/0004-6361:20053757

On the dynamics of the AB Doradus system

J. C. Guirado1, I. Martí-Vidal1, J. M. Marcaide1, L. M. Close2, J. C. Algaba1, W. Brandner3, J.-F. Lestrade4, D. L. Jauncey5, D. L. Jones6, R. A. Preston6 and J. E. Reynolds5

1  Departamento de Astronomía y Astrofísica, Universidad de Valencia, 46100 Burjassot, Valencia, Spain
    e-mail: jose.c.guirado@uv.es
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

(Received 4 July 2005 / Accepted 21 September 2005)

Abstract
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 $M_\odot$ 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 $M_\odot$ 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

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© ESO 2006


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