Abstract
The semi-detached eclipsing binary system V621 Cen ( P = 3.68 d) has been analysed using the Wilson–Devinney program, on the basis of light curves obtained in the Geneva 7-colour photometric system, and radial velocity curves for both components measured with the cross-correlation technique. The physical and orbital parameters have been determined through a self-consistent simultaneous solution of the photometric and radial velocity curves. The effective temperature of the primary component has been determined from the photometric analysis, T eff 1 = 15 , 600 ± 800 K . The absolute elements of the components are for the primary (mass gainer), with the value of T eff 1 fixed, M 1 = 6.10 ± 0.10 M ⊙, R 1 = 4.58 ± 0.01 R ⊙, M bol 1 = - 2.83 ± 0.01 , and for the secondary (mass loser), M 2 = 2.09 ± 0.04 M ⊙, R 2 = 5.87 ± 0.01 R ⊙, M bol 2 = - 0.86 ± 0.01 , T eff 2 = 8750 ± 20 K . The semi-major axis A of the relative orbit is 20.20 ± 0.12 R ⊙. The estimated spectral types of the components are about B3/4 V (primary) and A0/1III (secondary). The equatorial rotational velocity of the primary is 63 km s −1. The distance to V621 Cen is evaluated to 1550 ± 140 pc, and the colour excess E[ B2 − V1] to 0.270 ± 0.045.
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