Table 1
Log of our SAM observations with SPHERE/IRDIS and long-baseline interferometry with GRAVITY, together with some information about the observation of the literature data.
| Star | Date | MJD (day) | DIT (s) | NDIT | NEXP | Sp. Chan. | 〈Seeing〉 | 〈τ0〉 (ms) | Baselines | # |
|---|---|---|---|---|---|---|---|---|---|---|
| SPHERE | ||||||||||
| AU Mic | 2018-08-12 | 58342.22527 | 1 | 90 | 5 | 1 | 0.51 | 6.1 | – | – |
| Sky | 2018-08-12 | 58342.23169 | 1 | 10 | 1 | 1 | 0.47 | 6.0 | – | – |
| AU Mic | 2018-08-12 | 58342.23624 | 1 | 90 | 5 | 1 | 0.53 | 5.5 | – | – |
| HD 196919 | 2018-08-12 | 58342.24860 | 1 | 40 | 6 | 1 | 0.50 | 6.0 | – | – |
| Sky | 2018-08-12 | 58342.25213 | 1 | 10 | 1 | 1 | 0.52 | 5.8 | – | – |
| AU Mic | 2018-08-12 | 58342.26256 | 1 | 30 | 15 | 1 | 0.48 | 5.8 | – | – |
| Sky | 2018-08-12 | 58342.26847 | 1 | 10 | 1 | 1 | 0.51 | 5.1 | – | – |
| AU Mic | 2018-08-12 | 58342.27387 | 1 | 30 | 15 | 1 | 0.51 | 5.6 | – | – |
| HD 196919 | 2018-08-12 | 58342.28662 | 1 | 40 | 6 | 1 | 0.54 | 6.4 | – | – |
| Sky | 2018-08-12 | 58342.29015 | 1 | 10 | 1 | 1 | 0.51 | 6.4 | – | – |
| AU Mic | 2018-08-12 | 58342.29770 | 1 | 30 | 12 | 1 | 0.47 | 6.5 | – | – |
| Sky | 2018-08-12 | 58342.30257 | 1 | 10 | 1 | 1 | 0.41 | 7.2 | – | – |
| NACO | ||||||||||
| AU Mic | 2011-08-31 | 55804.15287 | 0.04 | 600 | 104 | 1 | 0.82 | 3.1 | – | – |
| PIONIER | ||||||||||
| 2011-08-09 | 55782.30522 | 0.21 | 100 | 1 | 3 | 0.64 | 6.9 | A1-G1-I1-K0 | 1 | |
| 2011-08-09 | 55782.31373 | 0.21 | 200 | 5 | 3 | 0.78 | 5.7 | A1-G1-I1-K0 | 1 | |
| 2011-08-09 | 55782.32517 | 0.21 | 100 | 1 | 3 | 0.66 | 6.8 | A1-G1-I1-K0 | 1 | |
| 2011-08-09 | 55782.34457 | 0.21 | 100 | 1 | 3 | 0.63 | 7.1 | A1-G1-I1-K0 | 1 | |
| 2011-11-03 | 55868.01837 | 0.39 | 100 | 5 | 7 | 0.94 | 2.3 | D0-G1-H0-I1 | 2 | |
| 2011-11-03 | 55868.03855 | 0.39 | 100 | 5 | 7 | 0.64 | 3.4 | D0-G1-H0-I1 | 2 | |
| 2011-11-03 | 55868.05373 | 0.39 | 100 | 5 | 7 | 0.97 | 2.3 | D0-G1-H0-I1 | 2 | |
| 2011-11-03 | 55868.06742 | 0.39 | 100 | 5 | 7 | 1.01 | 2.2 | D0-G1-H0-I1 | 2 | |
| 2011-11-03 | 55868.07997 | 0.39 | 100 | 5 | 7 | 1.17 | 1.9 | D0-G1-H0-I1 | 2 | |
| 2011-11-03 | 55868.09390 | 0.39 | 100 | 5 | 7 | 0.81 | 2.8 | D0-G1-H0-I1 | 2 | |
| AU Mic | 2011-11-03 | 55868.10677 | 0.39 | 100 | 5 | 7 | 0.99 | 2.2 | D0-G1-H0-I1 | 2 |
| 2011-11-03 | 55868.12090 | 0.39 | 100 | 5 | 7 | 0.99 | 2.3 | D0-G1-H0-I1 | 2 | |
| 2013-08-09 | 56513.10329 | 0.39 | 100 | 5 | 3 | 0.92 | 2.5 | A1-B2-C1-D0 | 3 | |
| 2013-08-09 | 56513.11264 | 0.39 | 100 | 5 | 3 | 0.76 | 3.0 | A1-B2-C1-D0 | 3 | |
| 2013-08-09 | 56513.12271 | 0.39 | 100 | 5 | 3 | 0.75 | 3.0 | A1-B2-C1-D0 | 3 | |
| 2013-08-11 | 56515.07933 | 0.39 | 100 | 5 | 3 | 1.24 | 3.5 | A1-B2-C1-D0 | 4 | |
| 2013-08-11 | 56515.08979 | 0.39 | 100 | 5 | 3 | 1.42 | 4.0 | A1-B2-C1-D0 | 4 | |
| 2013-08-11 | 56515.09935 | 0.39 | 100 | 5 | 3 | 1.12 | 4.4 | A1-B2-C1-D0 | 4 | |
| 2014-10-12 | 56942.09731 | 0.38 | 100 | 5 | 3 | 1.42 | 1.7 | A1-B2-C1-D0 | 5 | |
| 2014-10-12 | 56942.10788 | 0.38 | 100 | 5 | 3 | 1.32 | 1.8 | A1-B2-C1-D0 | 5 | |
| 2014-10-12 | 56942.11896 | 0.38 | 100 | 5 | 3 | 1.61 | 1.5 | A1-B2-C1-D0 | 5 | |
| 2014-10-12 | 56942.13064 | 0.38 | 100 | 5 | 3 | 1.48 | 1.6 | A1-B2-C1-D0 | 5 | |
| GRAVITY | ||||||||||
| 2016-06-16 | 57555.43405 | 30 | 10 | 5 | 1742 | 1.18 | 3.7 | A0-G1-J2-K0 | – | |
| AU Mic | 2016-06-16 | 57555.44252 | 30 | 10 | 5 | 1742 | 1.12 | 3.0 | A0-G1-J2-K0 | – |
| 2016-06-16 | 57555.45238 | 30 | 10 | 5 | 1742 | 1.35 | 3.0 | A0-G1-J2-K0 | – | |
Notes. Sp. Chan. is the number of spectral channel, (Seeing) is the average seeing as provided by the Differential Motion Image Monitor (DIMM) at 0.5 µm, and 〈τ0〉 the coherence time provided by the MASS-DIMM and Baselines is the telescope configuration. The calibrators used are HD 197540 (G8III, V = 6.50 mag, H = 4.32 mag, θLD = 0.645 ± 0.046 mas), HD 201865 (K2III, V = 7.14 mag, H = 4.04 mag, θLD = 0.793 ± 0.075 mas) and HD 202775 (K4/5III, V = 7.49 mag, H = 4.05 mag, θld = 0.844 ± 0.072 mas) for #1, HD 202293 (K5III, V = 7.92 mag, H = 3.74 mag, θLD = 0.994 ± 0.088 mas), HD 196387 (K4III, V = 7.28 mag, H = 3.52 mag, θLD = 1.110 ± 0.106 mas) and HD 202775 for #2, HD 197540, HD 194432 (K1III, V = 7.16 mag, H = 4.87 mag, θld = 0.555 ± 0.013 mas) and HD 200750 (K1III, V = 6.81 mag, H = 4.53 mag, θLD = 0.627 ± 0.047 mas) for #3, HD 197540, HD 194432 and HD 200750 for #4, and HD 196387 for #5.
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