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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308737.0, MPI für Astronomie / Publikationen_mpia
On the dynamics of the AB Doradus system
Authors:Guirado, J. C.; Martí-Vidal, I.; Marcaide, J. M.; Close, L. M.; Algaba, J. C.; Brandner, W.; Lestrade, J. F.; Jauncey, D. L.; Jones, D. L.; Preston, R. A.; Reynolds, J. E.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Astronomy and Astrophysics
Start Page:733
End Page:738
Audience:Not Specified
Abstract / Description: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_o 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_o 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.
Free Keywords:astrometry; stars: kinematics; stars: binaries: close; stars: late-type; stars: individual: Rst 137 B; stars: individual: AB Dor
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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