2008MNRAS.385..381B

New high-resolution spectra of V716 Cen revealed for the first time lines of the secondary component and its radial velocities. The simultaneous solution of the new radial velocity curves and the Hipparcos light curve yield the reliable absolute dimensions of this semidetached system. The masses for the primary and secondary are M₁= 5.68±0.07M_solar and M₂= 2.39±0.05M_solar, respectively, and the radii are R₁= 4.08±0.07R_solar and R₂= 3.36±0.02R_solar. We derive also effective temperatures of T_eff1= 15500±50 K and T_eff2 = 9000±80 K, and equatorial rotational velocities of v_rotsini = 137±2 km/s and v_rotsini = 116±7 km/s. These rotational velocities imply that the components rotate synchronously. The distance to the system is d = 339±8 pc, in good agreement with the less accurate Hipparcos distance (337±72 pc). The primary is underluminous and the secondary overluminous compared to normal main-sequence stars of the same mass. This implies that the secondary component of the semidetached system is in slow mass transferring stage after mass ratio reversal, although the Hα-line profiles do not show clear evidence for this.