On the dynamics of the AB Doradus system

J. C. Guirado, I. Marti-Vidaĺ, J. M. Marcaide, Laird 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 journalArticle

21 Citations (Scopus)

Abstract

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
Volume446
Issue number2
DOIs
StatePublished - Feb 2006

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wavelength
orbits
stars
parallax
wavelengths
monitoring
estimates
analysis

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Guirado, J. C., Marti-Vidaĺ, I., Marcaide, J. M., Close, L. M., Algaba, J. C., Brandner, W., ... Reynolds, J. E. (2006). On the dynamics of the AB Doradus system. Astronomy and Astrophysics, 446(2), 733-738. https://doi.org/10.1051/0004-6361:20053757

On the dynamics of the AB Doradus system. / Guirado, J. C.; Marti-Vidaĺ, I.; Marcaide, J. M.; Close, Laird M; Algaba, J. C.; Brandner, W.; Lestrade, J. F.; Jauncey, D. L.; Jones, D. L.; Preston, R. A.; Reynolds, J. E.

In: Astronomy and Astrophysics, Vol. 446, No. 2, 02.2006, p. 733-738.

Research output: Contribution to journalArticle

Guirado, JC, Marti-Vidaĺ, I, Marcaide, JM, Close, LM, Algaba, JC, Brandner, W, Lestrade, JF, Jauncey, DL, Jones, DL, Preston, RA & Reynolds, JE 2006, 'On the dynamics of the AB Doradus system', Astronomy and Astrophysics, vol. 446, no. 2, pp. 733-738. https://doi.org/10.1051/0004-6361:20053757
Guirado JC, Marti-Vidaĺ I, Marcaide JM, Close LM, Algaba JC, Brandner W et al. On the dynamics of the AB Doradus system. Astronomy and Astrophysics. 2006 Feb;446(2):733-738. https://doi.org/10.1051/0004-6361:20053757
Guirado, J. C. ; Marti-Vidaĺ, I. ; Marcaide, J. M. ; Close, Laird M ; Algaba, J. C. ; Brandner, W. ; Lestrade, J. F. ; Jauncey, D. L. ; Jones, D. L. ; Preston, R. A. ; Reynolds, J. E. / On the dynamics of the AB Doradus system. In: Astronomy and Astrophysics. 2006 ; Vol. 446, No. 2. pp. 733-738.
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AU - Algaba, J. C.

AU - Brandner, W.

AU - Lestrade, J. F.

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AB - 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.

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KW - Stars: kinematics

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