Publications of the MPIfR
Optical & Infrared
Interferometry Group
T. Driebe, H.C. Woodruff, M. Eberhardt,
K.-H. Hofmann, K. Ohnaka, A. Richichi, D. Schertl, M. Schoeller, M.
Scholz, G. Weigelt, M. Wittkowski, and P.R. Wood
Interferometric observations of the Mira star
o Ceti with the VLTI/VINCI
instrument in the near-infrared
"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.503-504 (2008)
Abstract
We present K-band commissioning observations of the Mira star prototype
o Cet obtained at the ESO Very Large Telescope Interferometer (VLTI)
with the VINCI instrument and two siderostats mounted to the VLTI
stations EO and GO, forming an unprojected baseline length of 16 m.
Rosseland angular radii were derived from the measured visibilities by
fitting theoretical visibility functions obtained from center-to-limb
intensity variations (CLVs) of different Mira star models, and the
phase dependence of the visibility function and the apparent diameter
have been investigated. Comparison of the derived Rosseland radii,
effective temperatures, and the shape of the observed visibility
functions with model predictions suggests that o Cet is a fundamental
mode pulsator.
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