Table 4.
Orbital parameters for MWC 166 A.
| Parameter (1) | RV only (2) | ORBITX orbit (3) | Grid-search orbit (4) |
|---|---|---|---|
| P [yr] | 0.50296 ± 0.00027 | 1.0067 ± 0.0001 | 1.0066 ± 0.0002 |
| P [days] | 183.70 ± 0.10 | 367.69 ± 0.04 | 367.65 ± 0.07 |
| T0 [yr] | 1993.3581 ± 0.0078 | 2020.0722 ± 0.0003 | 2020.0713 ± 0.0010 |
| a1 [mas] | – | 2.6122 ± 0.0385 | 2.684 ± 0.008 |
| i [°] | – | 53.62 ± 0.32 | 55.27 ± 0.11 |
| a1 sin i [mas] | 2.15 ± 0.07 (a) | – | – |
| e | 0.28 ± 0.03 | 0.498 ± 0.001 | 0.492 ± 0.003 |
| Ω [°] | – | 306.3 ± 0.2 | 304.9 ± 0.2 |
| ω [°] | 263.8 ± 6.6 | 313.8 ± 0.2 | 315.6 ± 0.5 |
| K1 [km s−1] | 18.6 ± 0.7 | 20.3 ± 0.4 | 20.3 ± 0.4 |
| V0 [km s−1] | 44.2 ± 0.5 | 35.3 ± 0.3 | 34.7 ± 0.3 |
| Mtot [M⊙] (b) | – | 17.05 ± 2.70 | 18.52 ± 2.81 |
Notes. Column (2) gives the RV fit obtained by Pogodin et al. (2006). Columns (3) and (4) give the best-fit orbital solution including both RV data and the astrometry data, using the ORBITX and the grid-search methods, respectively. These solutions were derived using the background geometric model described in Sect. 3.1.1.
Pogodin et al. (2006) returns a sin i = 60 ± 2 R⊙. A conversion to milliarcseconds has been made to allow a better comparison with the calculated semi-major axis and inclination. The distance used was 990 pc.
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