Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
K.-H. Hofmann, U. Beckmann, T. Blöcker,
V. Coude de Foresto,
M. Lacasse, B. Mennesson,
R. Millan-Gabet, S. Morel, G. Perrin, B. Pras,
C. Ruilier, D. Schertl, M. Schöller,
M. Scholz,
V. Shenavrin, W. Traub, G. Weigelt, M. Wittkowski, and B. Yudin:
Observations of Mira stars with the
IOTA/FLUOR interferometer and
comparison with Mira star models
New Astronomy 7, 9-20 (2001)
Abstract.
We present K'-band observations of five Mira stars with the IOTA
interferometer. The interferograms were obtained with the FLUOR fiber
optics beam combiner, which provides high-accuracy
visibility measurements in spite of time-variable atmospheric
conditions.
For the M-type Miras X Oph, R Aql, RU Her, R Ser, and
the C-type Mira V CrB we derived the
uniform-disk diameters 11.7mas, 10.9mas, 8.4mas, 8.1mas, and 7.9mas
(+/-0.3 mas), respectively.
Simultaneous photometric observations
yielded the bolometric fluxes. The derived angular Rosseland radii
and the bolometric fluxes allowed the determination of effective
temperatures. For instance, the effective temperature of R Aql was
determined
to be 2970+/-110 K. A linear Rosseland radius for
R Aql of 250+100/-60 Rsol
was derived from the angular Rosseland radius of 5.5mas+/-0.2mas and
the
HIPPARCOS parallax of 4.73mas+/-1.19mas.
The observations were compared with
theoretical Mira star models of Bessell, Scholz & Wood (1996) and
Hofmann, Scholz & Wood (1998).
The effective temperatures of the M-type Miras and the linear radius of
R Aql indicate fundamental mode pulsation.
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