Publications of the MPIfR
Optical & Infrared
Interferometry Group
Th. Preibisch, Th. Driebe, S.
Kraus, R. Lachaume, R. van Boekel, G. Weigelt
VLTI MIDI observations of the Herbig Ae star
HR~5999
"ESO Astrophysics Symposia"
Proceedings of the ESO Workshop: "The power of
optical/IR interferometry: recent scientific results and 2nd generation
VLTI instrumentation"
April 4-8, 2005 in Garching, Germany
pg.249-253 (2008)
Abstract
We have used long baseline mid-infrared interferometric observations
with MIDI at the VLTI to resolve the circumstellar material around the
Herbig Ae star HR 5999 and to provide the first direct measurement of
its angular size. Our data yield visibilities between ~ 0.5 and ~ 0.9
at 10µm, what implies that the mid- infrared emission from HR 5999 is
clearly resolved, but has a compact structure not much larger than the
resolution limit of the MIDI observations. The characteristic size of
the emission region depends on the projected baseline lengths and
position angles, and ranges between 10 and 25 milliarcseconds,
corresponding to ~ 2 - 5 AU for a uniform disk model, and 5 - 15 mas (~
1 - 3 AU) for a Gauss model (FWHM). We find a dependence of the
characteristic size on the projected baseline position angle, which
suggests asymmetry of the emission region. To derive constraints on the
geometry of the dust distribution we compare our interferometric
measurements to 2D, frequency-dependent radiation transfer simulations
of circumstellar disks.
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