The size of AB Doradus A from VLTI/AMBER interferometry

被引:32
|
作者
Guirado, J. C. [1 ]
Marcaide, J. M. [1 ]
Marti-Vidal, I. [2 ]
Le Bouquin, J-B [3 ]
Close, L. M. [4 ]
Cotton, W. D. [5 ]
Montalban, J. [6 ]
机构
[1] Univ Valencia, Dpto Astron & Astrofis, E-46100 Valencia, Spain
[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[3] CNRS UJF UMR 5571, Lab Astrophys Grenoble, F-38400 St Martin Dheres, France
[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[5] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
[6] Univ Liege, Inst Astrophys & Geophys, B-4000 Cointe Ougree, Belgium
关键词
stars: pre-main sequence; stars: fundamental parameters; techniques: interferometric; stars: individual: AB Doradus; STELLAR TURBULENT CONVECTION; MAIN-SEQUENCE STARS; DIFFERENTIAL ROTATION; EVOLUTIONARY TRACKS; ECLIPSING BINARY; PHOTOMETRY; MODELS; SYSTEM; AGE; CONSTRAINTS;
D O I
10.1051/0004-6361/201117426
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The pre-main sequence (PMS) star AB Dor A is the main component of the quadruple system AB Doradus. The precise determination of the mass and photometry of the close companion to AB Dor A, AB Dor C, has provided an important benchmark for calibration of theoretical evolutionary models of low-mass stars. The limiting factor to the precision of this calibration is the age of the system, as both the mass and luminosity of AB Dor A and C are well monitored by other ongoing programs. In this paper we present VLTI/AMBER observations of AB Dor A which provide a direct measurement of the size of this star, 0.96 +/- 0.06 R(circle dot). The latter estimate, combined with other fundamental parameters also measured for this star, allows a precise test of PMS evolutionary models using both H-R diagrams and mass-radius relationships. We have found that our radius measurement is larger than that predicted by the models, which we interpret as an evidence of the oversizing produced by the strong magnetic activity of AB Dor A. Considering, at least partially, this magnetic effect, theoretical isochrones have been used to derive constraints to the age of AB Dor A, favouring an age about 40-50 Myr for this system. Older ages are not completely excluded by our data.
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页数:7
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