Title: Is Arcturus a well-understood K giant? Test of model atmospheres and potential companion detection by near-infrared interferometry
Authors: Verhoelst, Tijl ×
Borde, PJ
Perrin, G
Decin, Leen
Eriksson, K
Ridgway, ST
Schuller, PA
Traub, WA
Millan-Gabet, R
Lacasse, MG
Waelkens, Christoffel #
Issue Date: May-2005
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:435 issue:1 pages:289-301
Abstract: We present near-IR interferometric measurements of the K1.5 giant Arcturus (alpha Bootis), obtained at the IOTA interferometer with the FLUOR instrument, in four narrow filters with central wavelengths ranging from 2.03 mu m to 2.39 mu m. These observations were expected to allow us to quantify the wavelength dependence of the diameter of a typical K giant. They are compared to predictions from both plane-parallel and spherical model atmospheres. Unexpectedly, neither can explain the observed visibilities. We show that these data suggest the presence of a companion, in accordance with the Hipparcos data on this star, and discuss this solution with respect to Arcturus' single star status.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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