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Table 2

AMBER observation log.

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

I 2008-02-22 A0-D0-H0 60/91/30 89/89/89 0.65 21 HD 50281 1.0 ± 0.1 a
II 2008-02-22 A0-D0-H0 60/91/30 92/92/92 0.72 100 HD 85313 0.451 ± 0.045 b
III 2008-02-22 A0-D0-H0 55/82/27 112/112/112 0.69 100 HD 85313 0.451 ± 0.045 b
IV 2008-02-22 A0-D0-H0 51/77/26 126/126/126 0.57 100 HD 85313 0.451 ± 0.045 b
V 2008-12-14 U1-U3-U4 88/61/124 219/289/247 26 HD 50277 0.356 ± 0.036 b
VI 2009-12-31 U2-U3-U4 41/62/89 229/291/267 1.1 21 HD 85313 0.451 ± 0.045 b

Notes. The resulting uv coverage is shown in Fig. 1. Bproj describes the projected baseline length, PA the position angles of the baselines, and DIT the detector integration time. We assumed the calibrator diameter error to be 10%.

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