Left panel: the 2003 IOTA closure phases on which the astrometric fit of Sect. 3.4 was based, together with two models, as a function of the maximal spatial frequency in the baseline triangle. The green circles are for a model including only the post-AGB star offset to a position (x,y) = ( − 0.4, –0.4) mas. The red crosses illustrate the effect of adding the secondary at a position (+0.4, +0.4) mas and contributing 10% of the total flux. Right panel: squared visibilities at 673 nm with some models overplotted. The full blue, dashed green, and dotted red lines correspond to star+ring models with ring diameters and widths of (5.5, 1.0), (3.0, 3.0), and (1.0, 4.5), respectively. The red filled circles correspond to the best binary model deduced in Sect. 3.2 and online Fig. 7. The other wavelengths are shown online in Fig. 6. The legend lists the value, which is the same for all four models.
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