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First Results from the CHARA Array. VII. Long‐Baseline Interferometric Measurements of Vega Consistent with a Pole‐On, Rapidly Rotating Star

  • Authors: J. P. Aufdenberg, A. Mérand, V. Coudé du Foresto, O. Absil, E. Di Folco, P. Kervella, S. T. Ridgway, D. H. Berger, T. A. ten Brummelaar, H. A. McAlister, J. Sturmann, L. Sturmann, and N. H. Turner

Aufdenberg et al. 2006 The Astrophysical Journal 645 664.

  • Provider: AAS Journals

Caption: Fig. 1.

Sampling of the ﹩\left(u,\ v\right)﹩‐plane for the CHARA/FLUOR Vega data set. The diamonds represent the monochromatic sampling at 2.0 μm within the ﹩K^{\prime }﹩ band. In the ﹩K^{\prime }﹩ band, the CHARA baselines E2‐W2, E2‐W1, E2‐S1, and W2‐S1 sample the lower first lobe, first null, and second lobe of Vega’s visibility curve. Two‐telescope observations have a 180° ambiguity in the position angle, therefore we plot two coordinates, (﹩u,\ v﹩) and (﹩-u,\ -v﹩), for each of the 25 data points. These (﹩u,\ v﹩) points overlay a model for Vega’s two‐dimensional monochromatic Fourier appearance. This squared visibility model is a Fast Fourier Transform (displayed with a logarithmic stretch) of a synthetic intensity map of Vega in the plane of the sky (see Fig. 3).

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