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

doi:10.1051/0004-6361:20053757

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

Astronomy

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29 Scopus citations

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 language	English (US)
Pages (from-to)	733-738
Number of pages	6
Journal	Astronomy and astrophysics
Volume	446
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20053757
State	Published - Feb 2006

Keywords

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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title = "On the dynamics of the AB Doradus system",

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.",

keywords = "Astrometry, Stars: binaries: close, Stars: individual: AB Dor, Stars: individual: Rst 137 B, Stars: kinematics, Stars: late-type",

author = "Guirado, {J. C.} and I. Marti-Vida{\'l} and Marcaide, {J. M.} and Close, {L. M.} and Algaba, {J. C.} and W. Brandner and Lestrade, {J. F.} and Jauncey, {D. L.} and Jones, {D. L.} and Preston, {R. A.} and Reynolds, {J. E.}",

year = "2006",

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doi = "10.1051/0004-6361:20053757",

language = "English (US)",

volume = "446",

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T1 - On the dynamics of the AB Doradus system

AU - Guirado, J. C.

AU - Marti-Vidaĺ, I.

AU - Marcaide, J. M.

AU - Close, L. M.

AU - Algaba, J. C.

AU - Brandner, W.

AU - Lestrade, J. F.

AU - Jauncey, D. L.

AU - Jones, D. L.

AU - Preston, R. A.

AU - Reynolds, J. E.

PY - 2006/2

Y1 - 2006/2

N2 - 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.

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.

KW - Astrometry

KW - Stars: binaries: close

KW - Stars: individual: AB Dor

KW - Stars: individual: Rst 137 B

KW - Stars: kinematics

KW - Stars: late-type

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On the dynamics of the AB Doradus system

Abstract

Keywords

ASJC Scopus subject areas

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