2008
DOI: 10.1051/0004-6361:200809611
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The limb-darkened Arcturus: imaging with the IOTA/IONIC interferometer

Abstract: Aims.We undertook an H band interferometric examination of Arcturus, a star frequently used as a spatial and spectral calibrator. Methods. Using the IOTA 3 telescope interferometer, we performed spectro-interferometric observations (R ≈ 35) of Arcturus. Atmospheric models and prescriptions were fitted to the data to derive the brightness distribution of the photosphere. Image reconstruction was performed using two software algorithms: Wisard and Mira.Results. An achromatic power law proved to be a good model o… Show more

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Cited by 53 publications
(51 citation statements)
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“…T eff = 4303 ± 47 (Quirrenbach et al 1996), 4290 ± 30 (Griffin & Lynas-Gray 1999), and 4295 ± 26 K (Lacour et al 2008). We adopt the last value in the following.…”
Section: Physical Parametersmentioning
confidence: 99%
“…T eff = 4303 ± 47 (Quirrenbach et al 1996), 4290 ± 30 (Griffin & Lynas-Gray 1999), and 4295 ± 26 K (Lacour et al 2008). We adopt the last value in the following.…”
Section: Physical Parametersmentioning
confidence: 99%
“…In this paper we used two of them: MIRA and WISARD. Both are presented and compared in Le Besnerais (2008) and in Lacour et al (2008). The major advantage of such methods is that they can reveal structures by reconstructing an image which fits the data and which is also close to an a priori image of the object.…”
Section: Image Reconstruction and Asymmetriesmentioning
confidence: 99%
“…Owing to the large apparent diameter of Arcturus (21.05 ± 0.21 mas), Lacour et al (2008) attempted to directly image its surface via interferometry, using a technique similar to that successfully applied to Altair (α Aql) by Monnier et al (2007) with a resolution of <1 mas. They failed to detect surface inhomogeneities, and concluded that the most probable brightness distribution is that of a simple limb-darkened disk.…”
Section: Possible Magnetic Field Generatorsmentioning
confidence: 99%