The limb-darkened Arcturus: imaging with the IOTA/IONIC interferometer

  title={The limb-darkened Arcturus: imaging with the IOTA/IONIC interferometer},
  author={Sylvestre Lacour and Serge Meimon and {\'E}ric Thi{\'e}baut and Guy Perrin and Tijl Verhoelst and Ettore Pedretti and Peter A. Schuller and Laurent M. Mugnier and John D. Monnier and J-P. Berger and X. Haubois and A. Poncelet and Guy Le Besnerais and Kjell Eriksson and Rafael Millan-Gabet and Marc G. Lacasse and Wesley A. Traub},
  journal={Astronomy and Astrophysics},
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… Expand
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