Publications of the MPIfR
Optical & Infrared
Interferometry Group
Di Folco, E.; Thévenin, F.; Kervella,
P.; Domiciano de Souza, A.; Coudé du Foresto, V.; Ségransan, D.; Morel,
P.
VLTI near-IR interferometric observations of
Vega-like stars. Radius and age of α PsA, β Leo, β Pic, ɛ Eri and τ Cet
Astronomy and Astrophysics, v.426, p.601-617 (2004)
Abstract
We report in this paper the direct interferometric measurement of the
angular diameter of five nearby Vega-like stars: α PsA, β
Leo, β Pic, ɛ Eri and τ Cet. The near-infrared (K and H
bands) observations were conducted at the VLTI during the commissioning
period with the VINCI instrument and three different baselines ranging
from 66 m to 140 m. The five stellar photospheres are resolved and we
derive their angular diameters with a 1 to 2% accuracy, except for
β Pic (14%). We discuss the detectability and the influence of a
possible small amount of warm circumstellar dust on our measurements.
In
addition, we have used the stellar evolution code CESAM (Morel
\cite{m97}) to compare the computed fundamental parameters to the
observed values (linear diameter, luminosity, temperature and chemical
abundance). As a result of the simulation, the age of the stars is
inferred and found to be in good agreement with previous estimates from
various other methods.
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