...2,

Michelson Postdoctoral Fellow.

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...1,

Postdoctoral Fellow of the Fund for Scientific Research, Flanders.

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... filter

High spectral resolution interferometric observations, e.g. with VLTI/AMBER (Petrov et al. 2000) will resolve the individual spectral lines visible between $\mu=0.2~{\rm and}~0.0$. The difference in the visibility curve between such a spectral line and the continuum will be much stronger than that between the different FLUOR filters discussed here.

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... primary

Note that a Brown Dwarf is not a possibility as it would not reach the required brightness (4 mag) in the K band as derived from the contrast ratio r.

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... interval

The actual $T_{\rm eff}$ determined by Decin (2000) is beyond the grid-limit, but by extrapolation one can see that this probably does notinfluence our results.

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... photometry

The diameter of the primary was chosen in such a way as to obtain positive residuals (except for the J-band which is notoriously sensitive to the water column density in the Earth's atmosphere). This required a slightly smaller diameter than derived in Sect. 4.1.2, i.e. 20.0 mas.

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