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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).

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