Table 3.
Relative astrometry for MWC 166 Aa and Ab, derived from H and K band continuum visibility and closure phase modelling.
| Epoch | Inst. | ρ [mas] | θ [°] | f2/ftot | fext/ftot |  |
 |
|---|---|---|---|---|---|---|---|
| 2013-01-27 | PIONIER | 1.50 ± 0.09 | 309.8 ± 0.3 | 0.223 ± 0.015 | 0.021 ± 0.005 | 0.81 | 0.88 |
| 2013-02-20 | ″ | 1.68 ± 0.12 | 343.5 ± 1.1 | 0.189 ± 0.021 | 0.002 ± 0.001 | 1.88 | 0.90 |
| 2017-03-14 | GRAVITY | 1.59 ± 0.08 | 358.7 ± 0.4 | 0.289 ± 0.003 | 0.051 ± 0.004 | 2.11 | 1.07 |
| 2017-04-28(a) | ″ | 1.90 ± 0.10 | 47.4 ± 0.2 | 0.268 ± 0.003 | 0.116 ± 0.005 | 10.76 | 2.53 |
| 2018-01-11 | ″ | 0.89 ± 0.05 | 233.3 ± 1.0 | 0.295 ± 0.013 | 0.015 ± 0.003 | 0.71 | 1.04 |
| 2018-02-06 | ″ | 1.54 ± 0.08 | 306.2 ± 0.2 | 0.274 ± 0.003 | 0.023 ± 0.002 | 0.62 | 0.48 |
| 2018-11-30 (a) | PIONIER | 2.43 ± 0.12 | 138.2 ± 0.1 | 0.271 ± 0.001 | 0.013 ± 0.002 | 2.17 | 1.62 |
| 2019-12-16 (a) | ″ | 2.03 ± 0.11 | 148.1 ± 0.8 | 0.508 ± 0.005 | 0.011 ± 0.002 | 1.02 | 0.71 |
| 2019-12-24 (a) | ″ | 1.34 ± 0.07 | 154.2 ± 0.6 | 0.456 ± 0.002 | 0.087 ± 0.004 | 6.81 | 0.92 |
| 2019-12-29 | ″ | 1.34 ± 0.07 | 167.5 ± 0.1 | 0.429 ± 0.001 | 0.023 ± 0.002 | 2.43 | 0.72 |
| 2020-11-19 (a) | MIRC-X | 2.84 ± 0.14 | 131.1 ± 0.3 | 0.345 ± 0.004 | 0.150 ± 0.004 | 3.27 | 1.95 |
| 2020-12-13 | PIONIER | 2.09 ± 0.10 | 144.6 ± 0.1 | 0.410 ± 0.001 | 0.013 ± 0.002 | 0.86 | 0.89 |
| 2020-12-19 | ″ | 1.85 ± 0.09 | 149.7 ± 0.2 | 0.422 ± 0.008 | 0.035 ± 0.002 | 0.72 | 1.03 |
| 2020-12-28 | ″ | 1.53 ± 0.11 | 162.4 ± 1.3 | 0.675 ± 0.058 | 0.018 ± 0.005 | 0.57 | 0.39 |
Notes. The model includes two point sources and extended background emission, for a total of four free parameters: separation ρ, position of the secondary component θ (east of north), secondary flux f2/ftot, and extended flux fext/ftot. Dates are given in the format YYYY-MM-DD.
Data combines two days of observation modelled simultaneously, as defined in Table 1.
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