Physical parameters of the Algol system V621 Centauri from simultaneous analysis of Geneva 7-colour light curves

The absolute elements of the components are for the primary (mass gainer), with the value of Teff1 fixed, M1 = 6.10 ± 0.10M⊙, R1 = 4.58 ± 0.01R⊙, Mbol1=-2.83±0.01, and for the secondary (mass loser), M2 = 2.09 ± 0.04M⊙, R2 = 5.87 ± 0.01R⊙, Mbol2=-0.86±0.01, Teff2=8750±20K. The semi-major axis A of the relative orbit is 20.20 ± 0.12R⊙. 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.