Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-31
Astronomy and Astrophysics
Astrophysics
15 pages, 14 figures, accepted for publication by Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20042356
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 to 2.39 micron. 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 how 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.
Borde Pascal J.
Decin Leen
Eriksson Kimmo
Lacasse Marc G.
Millan-Gabet Rafael
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