Table 3.
Absolute and relative motion of δ Cep A and δ Cep B (HD 213307).
| δ Cep A | δ Cep B | |||
|---|---|---|---|---|
| α | δ | α | δ | |
| μHG | +14.0690.009 | +2.7030.016 | +14.1340.009 | +3.5480.015 |
| dvtan | +0.0890.013 | +1.1810.021 | ||
| μH | +15.350.22 | +3.520.18 | +16.190.59 | +4.280.50 |
| ΔμH | +1.280.23 | +0.820.19 | +2.060.59 | +0.730.51 |
| ΔH | 7.0 | 3.8 | ||
| μG2 | +17.640.81 | +3.980.73 | +14.090.09 | +3.790.09 |
| ΔμG2 | +3.570.82 | +1.270.72 | −0.040.11 | +0.240.12 |
| ΔG2 | 4.7 | 2.1 | ||
Notes. The absolute and linear proper motions (μ and Δμ) are expressed in mas a−1 and the differential tangential velocity of B relative to A (dvtan) in km s−1. The angular proper motion was converted to velocity using the GDR2 parallax of component B (ϖG2, B = 3.393 ± 0.049 mas).