On the dynamics of the AB Doradus system

J. C. Guirado, I. Marti-Vidaĺ, J. M. Marcaide, L. M. Close, J. C. Algaba, W. Brandner, J. F. Lestrade, D. L. Jauncey, D. L. Jones, R. A. Preston, J. E. Reynolds

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We present an astrometric analysis of the binary systems AB Dor A/AB DorC and AB DorBa/AB DorBb. 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 DorC, the very low mass companion to AB Dor A, which confirms the mass estimate of 0.090 M reported in previous works; (ii) a measurement of the parallax of AB DorBa, 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 on the mass of the pair AB DorBa/AB DorBb (50% probability). Further astrometric monitoring of the system at all possible wavelengths would determine with extraordinary precision the dynamical mass of its four components.

Original languageEnglish (US)
Pages (from-to)733-738
Number of pages6
JournalAstronomy and astrophysics
Issue number2
StatePublished - Feb 2006


  • Astrometry
  • Stars: binaries: close
  • Stars: individual: AB Dor
  • Stars: individual: Rst 137 B
  • Stars: kinematics
  • Stars: late-type

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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