2011A&A...533A.106G


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST07:35:13

2011A&A...533A.106G - Astronomy and Astrophysics, volume 533A, 106-106 (2011/9-1)

The size of AB Doradus A from VLTI/AMBER interferometry.

GUIRADO J.C., MARCAIDE J.M., MARTI-VIDAL I., LE BOUQUIN J.-B., CLOSE L.M., COTTON W.D. and MONTALBAN J.

Abstract (from CDS):

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±0.06R . 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 40-50Myr for this system. Older ages are not completely excluded by our data.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: fundamental parameters - techniques: interferometric - stars: individual: AB Doradus

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 445 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2990 0
3 HD 35199 * 05 18 43.9264159136 -62 59 05.812299983   8.63 7.20     K3III 10 0
4 V* AB Dor B ** 05 28 44.4833327579 -65 26 46.034324029     13.0     M5+M5-6 87 0
5 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 58 0
6 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0
7 HD 36908 * 05 36 41.4595922550 +37 23 22.711185613   9.46 9.39     A0 4 0
8 HD 39608 * 05 49 36.4588461030 -60 40 34.656424199   8.91 7.35     K5III 13 0
9 HD 39963 * 05 51 23.0867212699 -64 02 00.839621004   7.215 6.359     G8III 17 0
10 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 820 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-07:35:13

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