Table 2
Estimated systemic astrometric radial velocities and mass ratios for physical pairs.
| System | HIP (A) | HIP (B) | vr (CM) | ρ (CM) | q |  (dof) |
|---|---|---|---|---|---|---|
| GJ 338 AB | 45343 | 120005 | + 11.51 | + 152.82 ± 32.00 | 0.452 ± 0.092 | 9.60 (3) |
| + 11.67 | + 50.83 ± 20.76 | 0.959 | 26.41 (4) | |||
| GJ 725 AB | 91768 | 91772 | − 0.11 | + 16.71 ± 6.31 | 0.544 ± 0.030 | 49.90 (3) |
| + 0.04 | − 11.27 ± 4.79 | 0.766 | 89.71 (4) | |||
| 61 Cyg AB | 104214 | 104217 | − 65.14 | − 65.53 ± 2.25 | 0.758 ± 0.049 | 5.39 (3) |
| − 65.09 | − 67.03 ± 2.03 | 0.877 | 11.29 (4) |
Notes. Column 1: name of the system. Columns 2–3: HIPPARCOS identifiers of the components. Column 4: spectroscopic radial velocity (in km s−1) for the centre of mass (CM), using component values from SIMBAD and the given mass ratio. Column 5: estimated astrometric radial velocity of the centre of mass and its formal uncertainty (± σρ), both in km s−1. Column 6: estimated or assumed mass ratio q = MB∕MA. Column 7: goodness-of-fit with the number of degrees of freedom in brackets. For each system, the first line shows the result when both ρ and q are fitted, and the second shows the result when q is constrained to the value in the line (see text for references).
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