2005A&A...435..289V

Query : 2005A&A...435..289V

2005A&A...435..289V - Astronomy and Astrophysics, volume 435, 289-301 (2005/5-3)

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

VERHOELST T., BORDE P.J., PERRIN G., DECIN L., ERIKSSON K., RIDGWAY S.T., SCHULLER P.A., TRAUB W.A., MILLAN-GABET R., LACASSE M.G. and WAELKENS C.

Abstract (from CDS):

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 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.

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Journal keyword(s): techniques: interferometric - stars: individual: Arcturus - stars: atmospheres - stars: binaries: general

Simbad objects: 2

Full paper

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Number of rows : 2

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	* alf Boo	RG*	14 15 39.67207	+19 10 56.6730	2.46	1.18	-0.05	-1.03	-1.68	K1.5IIIFe-0.5	2318	1
2	V* EK Boo	LP?	14 46 05.9426993007	+15 07 54.411177125	8.51	7.20	5.63			M5+IIIab	79	0

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