Issue |
A&A
Volume 446, Number 2, February I 2006
|
|
---|---|---|
Page(s) | 635 - 641 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20053187 | |
Published online | 13 January 2006 |
The limb darkening of
Centauri B
Matching 3D hydrodynamical models with interferometric measurements
1
Département Cassiopée, UMR 6202, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France e-mail: lbigot@obs-nice.fr
2
LESIA, UMR 8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France
3
Observatoire de Genève, 1290 Sauverny, Switzerland
Received:
4
April
2005
Accepted:
12
September
2005
For the nearby dwarf star α Cen B (K1 V), we
present limb-darkening predictions from a 3D hydrodynamical
radiative transfer model of its atmosphere.
We first compared the results of this model to a standard Kurucz's
atmosphere. Then we used both predictions to fit the new
interferometric visibility measurements of α Cen B obtained
with the VINCI instrument of the VLT Interferometer.
Part of these new visibility measurements were obtained in the
second lobe of the visibility function, which is sensitive to
stellar limb-darkening.
The best agreement is found for the 3D atmosphere limb-darkening
model and a limb-darkened angular diameter of mas, corresponding to a linear radius of
(assuming
mas).
Our new linear radius agrees well with the asteroseismic value
predicted by Thévenin et al. (2002, A&A, 392, L9). In view of future
observations of this star with the VLTI/AMBER instrument, we also
present limb-darkening predictions in the J, H, and K bands.
Key words: instrumentation: interferometers / stars: atmospheres
© ESO, 2006
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