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Table 2

Observation log.

# Night Instrument B proj PA Seeing DIT Calibrator Calibrator diameter
[m] [°] [′′] [ms] [mas]

I 2009-04-17 AMBER 15/30/45 259/259/259 0.55 200 HD 142669 0.256 ± 0.018 a
II 2009-05-22 AMBER 31/61/91 258/258/258 0.8 150 HD 142669 0.256 ± 0.018 a
III 2011-04-30 AMBER 59/68/71 238/126/176 1.0 300 HD 138472 1.07 ± 0.02 b
IV 2011-04-30 AMBER 63/70/72 256/141/193 0.8 300 HD 138472 1.07 ± 0.02 b
V 2004-06-07 MIDI 102 37 0.9 14 HD 146791 3.00 ± 0.033 c
VI 2004-06-07 MIDI 90 44 1.1 18 HD 169916 4.24 ± 0.047 c

Notes. Bproj denotes the lengths of the projected interferometer baselines during the observations, PA the baseline position angles, and DIT the detector integration time for recording individual interferograms. The resulting uv coverage is shown in Fig. 1.

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