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Paper: Canopus Angular Diameter Revisited by the AMBER Instrument of the VLT Interferometer
Volume: 404, The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam Ching Leung
Page: 330
Authors: Bendjoya, P.; Domiciano de Souza, A.; Vakili, F.; Millour, F.; Petrov R.
Abstract: We used the VLTI/AMBER instrument to obtain interferometric data on the F0I star Canopus (visibilities and closure phases in the H and K bands with spectral resolution of 35). The adopted baselines (100 m) and the high quality of the VLTI/AMBER observations allowed us to measure fringe visibilities up to the third visibility lobe of Canopus.The angular diameter has been measured from the visibility and set to be (6.95 ± 0.15) mas. From this measured angular diameter we derive a stellar radius R = (72 ± 4)Rʘ and an effective temperature Teff = (7272 ± 107)K or Teff = (7570 ± 250)K depending on the considered bolometric flux and its precision. Contrarily to the theory, our VLTI/AMBER data do not reveal any limb darkening on Canopus in the near-IR. Our observations set new constraints on the physical parameters of this star.
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