Characterising the orbit and circumstellar environment of the high-mass binary MWC 166 A

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Volume 665 (September 2022)

A&A, 665 (2022) A146

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Table 6.

Model parameters corresponding to the best-fit PMOIRED circumprimary disc line models, for both spectral lines of interest, for each GRAVITY epoch (Sect. 5).

Epoch	2017-03-14		2017-04-27		2018-01-11		2018-02-06

Spec. Line	He I	Br γ	He I	Br γ	He I	Br γ	He I	Br γ
ρ [mas]	1.67 ± 0.01	1.65 ± 0.01	1.98 ± 0.01	1.98 ± 0.01	0.86 ± 0.02	0.90 ± 0.02	1.59 ± 0.01	1.56 ± 0.01
θ [°]	357.4 ± 0.3	357.8 ± 0.3	42.3 ± 0.3	42.0 ± 0.2	238.1 ± 1.1	238.9 ± 1.0	307.8 ± 0.2	307.3 ± 0.2
f₂	0.414 ± 0.004	0.359 ± 0.003	0.457 ± 0.004	0.402 ± 0.002	0.318 ± 0.025	0.240 ± 0.016	0.440 ± 0.007	0.399 ± 0.006

x_B [mas]	0.212 ± 0.017	0.192 ± 0.015	0.242 ± 0.034	0.255 ± 0.031	0.114 ± 0.016	0.223 ± 0.022	0.175 ± 0.013	0.161 ± 0.013
y_B [mas]	−0.118 ± 0.017	−0.184 ± 0.012	−0.226 ± 0.028	−0.118 ± 0.024	−0.091 ± 0.023	−0.076 ± 0.036	−0.052 ± 0.011	−0.123 ± 0.011
σ_B [mas]	0.121	0.133	0.166	0.141	0.073	0.118	0.091	0.102
f_B	0.712 ± 0.015	0.633 ± 0.015	0.668 ± 0.026	0.497 ± 0.023	0.533 ± 0.016	0.289 ± 0.020	0.945 ± 0.016	0.643 ± 0.015

x_R [mas]	−0.155 ± 0.011	−0.190 ± 0.013	−0.168 ± 0.021	−0.208 ± 0.021	−0.048 ± 0.017	0.040 ± 0.020	−0.130 ± 0.015	−0.053 ± 0.020
y_R [mas]	0.168 ± 0.009	0.135 ± 0.011	0.188 ± 0.017	0.202 ± 0.017	0.184 ± 0.026	0.244 ± 0.032	0.241 ± 0.014	0.243 ± 0.019
σ_R [mas]	0.114	0.117	0.126	0.145	0.095	0.124	0.137	0.124
f_R	1.074 ± 0.014	0.688 ± 0.013	1.009 ± 0.021	0.664 ± 0.017	0.425 ± 0.014	0.309 ± 0.016	0.603 ± 0.014	0.326 ± 0.012

F_L	1.045 ± 0.016	1.046 ± 0.022	1.231 ± 0.031	1.340 ± 0.041	1.150 ± 0.026	1.386 ± 0.048	1.051 ± 0.018	1.330 ± 0.030
λ₀ [μm]	2.0590	2.1665	2.0593	2.1667	2.0593	2.1667	2.0592	2.1667
Δλ [μm]	0.617 ± 0.005	0.577 ± 0.006	0.568 ± 0.009	0.558 ± 0.011	0.578 ± 0.008	0.422 ± 0.016	0.606 ± 0.006	0.576 ± 0.011

χ²	2.55	2.37	4.18	3.07	2.22	1.95	3.53	3.04

Notes. Dates are given in the format YYYY-MM-DD.

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