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Precise measurement of the dynamical masses in AB Doradus

Published online by Cambridge University Press:  01 October 2007

J. C. Guirado ,
I. Martí-Vidal  and
J. M. Marcaide
J. C. Guirado
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad de ValenciaDr. Moliner 50, 46100 Burjassot, Valencia, Spain email: Jose.C.Guirado@uv.es
I. Martí-Vidal
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad de ValenciaDr. Moliner 50, 46100 Burjassot, Valencia, Spain email: Jose.C.Guirado@uv.es
J. M. Marcaide
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad de ValenciaDr. Moliner 50, 46100 Burjassot, Valencia, Spain email: Jose.C.Guirado@uv.es
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Abstract

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The radio stars ABDor A and ABDor B (=Rst137B) are the main components of the ABDoradus system. Both stars are double (ABDor A/ABDor C and ABDor Ba/ABDor Bb) and usual targets of astrometric instruments at optical (Hipparcos), infrared (VLT), and radio (VLBI) wavelengths. From a combination of all astrometric data available, we have obtained precise limits to the dynamical mass of both binaries in AB Doradus. The determination of the mass of ABDor C (0.090±0.003 M⊙) is important, since this object constitutes one of the few calibration points used to test theoretical evolutionary models of low-mass young stars. Follow-up observations both in radio (VLBI) and optical wavelengths (VLT) should determine with high precision the dynamical mass of the four components of this system.

Keywords

astrometrybinaries: closestars: individual (AB Doradus)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 496 - 497
Copyright
Copyright © International Astronomical Union 2008

References

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