Arcturus a well - understood K giant ? Test of model atmospheres and potential companion detection by near - infrared interferometry


We present near-IR interferometric measurements of the K1.5 giant Arcturus (α Bootis), obtained at the IOTA interferometer with the FLUOR instrument, in four narrow filters with central wavelengths ranging from 2.03μm to 2.39μm. These observations were expected to allow us to quantify the wavelength dependence of the diameter of a typical K giant. They are… (More)


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