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Characterization of the Twa22 AB system. A new calibrator for evolutionary tracks?

Published online by Cambridge University Press:  06 January 2010

T. Montmerle ,
D. Ehrenreich ,
A.-M. Lagrange ,
M. Bonnefoy ,
G. Chauvin ,
C. Dumas ,
A-M. Lagrange ,
H. Beust ,
B. Zuckerman  and
J-L. Beuzit
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M. Bonnefoy*
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
G. Chauvin
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
C. Dumas
Affiliation:
ESO, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
A-M. Lagrange
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
H. Beust
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
B. Zuckerman
Affiliation:
Department of Physics and Astronomy, Center for Astrobiology, University of California, Los Angeles, California 90095, USA
J-L. Beuzit
Affiliation:
Laboratoire d'Astrophysique de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
F. Allard
Affiliation:
CRAL-ENS, 46 Allée d'Italie, 69364 Lyon Cedex 07, France
I. Song
Affiliation:
Science Center/Caltech, M/S 220-6, 1200 E. California Blvd., Pasadena, CA 91125, USA
*
[email protected] ; [email protected] ; [email protected] ; [email protected] ; [email protected]
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Abstract

Tight binaries discovered in young nearby associations are ideal targets to provide dynamical mass measurments through orbital monitoring. Coupled with estimated temperatures, surface gravities and luminosities, direct mass measurments provide benchmarks for evolutionary models of low-mass stars (M ≤ 0.5 M๏) and brown dwarfs (M ≤ 0.078 M๏) at young ages (Age ≤ 100 Myrs). TWA22 AB is likely to be a member of the nearby TW Hydrae association (Age ~ 8 Myr). It was resolved in a tigh binary with a projected separation of a few AU. In this paper we present preliminary results on the companion orbital monitoring and on the spectral characterisation of the system.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 41: Physics and Astrophysics of Planetary Systems , 2010 , pp. 95 - 98
Copyright
© EAS, EDP Sciences, 2010

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