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Table 1

Main characteristics of the calibrators used during our PIONIER observations.

Star m v m H θUD ± σ (mas)

HD 181019 6.35 3.31 1.030 ± 0.014
HD 171042 7.51 3.63 1.030 ± 0.014
HD 175782 6.80 3.05 1.337 ± 0.019
HD 186530 7.41 4.01 0.896 ± 0.012

Notes. Calibrators were selected from the catalogue of Mérand et al. (2005a). We indicate the uniform disk diameter in H band and the corresponding uncertainty.

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