Publications of the MPIfR
Optical & Infrared
Interferometry Group
Roccatagliata, V., Wittkowski, M.,
Aufdenberg, J.P., Driebe, T., Wolff, B., Paresce, F.
Spectroscopic and Interferometric Tests of
Stellar Atmosphere Models: UVES and VINCI Measurements of the M-giant α
Cet
"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.489-490 (2008)
Abstract:
We present VLT/UVES spectroscopic and VLTI/VINCI interferometric
observations of the cool giant α Cet (M2 III). Spherically symmetric
PHOENIXstellar atmosphere models are tested by comparison with our
spectroscopic and interferometric observations. The high spectral
resolution of UVES allows us to constrain the effective temperature and
the surface gravity of the star by comparing observed and model
predicted bands that are temperature and gravity indicators. High
angular resolution and high precision VLTI/VINCI observations directly
measure the strength of the limb darkening effect of α Cet in the
K-band. We derive fundamental stellar parameters, namely a Rosseland
diameter of 12.08±0.18 mas corresponding to a Rosseland linear radius
of 88±6 R⊙, and an effective temperature of 3805+95-109
K, using the
Hipparcos parallax and the bolometric flux.
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