Table A.1
Relative astrometric positions and flux ratios of the ρ Oph A binary determined from GRAVITY data.
| Date | RJD | Baselines | ρ [mas] | PA [°] | ΔRA [mas] | ΔDEC [mas] | σ-a [mas] | σ-b [mas] | σ-PA [°] | f = fAb/fAa |
|---|---|---|---|---|---|---|---|---|---|---|
| 2023 Apr 18 | 60053.836 | D0-G2-J3-K0 | 8.449 | 301.670 | −7.191 | 4.436 | 0.0077 | 0.0026 | 173.6 | 0.709 ± 0.005 |
| 2023 May 16 | 60081.777 | D0-G2-J3-K0 | 2.317 | 20.407 | 0.808 | 2.172 | 0.0494 | 0.0078 | 139.4 | 0.576 ± 0.030 |
| 2023 Jun 15 | 60111.637 | D0-G2-J3-K0 | 3.315 | 157.030 | 1.294 | −3.052 | 0.0047 | 0.0039 | 113.1 | 0.702 ± 0.002 |
| 2023 Jul 12 | 60138.628 | D0-G2-J3-K0 | 8.169 | 298.888 | −7.153 | 3.947 | 0.0029 | 0.0018 | 140.3 | 0.705 ± 0.001 |
| 2023 Aug 13 | 60170.598 | D0-G2-J3-K0 | 2.305 | 29.272 | 1.127 | 2.010 | 0.0242 | 0.0082 | 139.8 | 0.700 ± 0.011 |
| 2023 Aug 14 | 60171.534 | D0-G2-J3-K0 | 2.266 | 42.504 | 1.531 | 1.671 | 0.0054 | 0.0023 | 169.7 | 0.703 ± 0.002 |
| 2023 Sep 17 | 60205.487 | D0-G2-J3-K0 | 2.252 | 222.747 | −1.529 | −1.654 | 0.0050 | 0.0023 | 151.2 | 0.699 ± 0.003 |
Notes. ρ is the angular separation between the components, PA is the position angle (from north to east), ΔRA and ΔDEC are the Ab coordinates relative to Aa in the east and north direction, respectively, σ-a and σ-b are the major and minor axes of the error ellipse, respectively, σ-PA is the position angle of the error ellipse (from north to east), and f = fAb/fAa is the flux ratio.
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