WR 63: a multiple system (O+O) + WR?

The spectrum of the Wolf-Rayet (WR) star WR 63 contains spectral lines two different O stars that show regular radial velocity (RV) variations with amplitudes ~160 and ~225 km/s on a ~4.03 d period. light-curve shows narrow eclipses are 0.2 mag deep same period as RV changes. On other hand, our data no significant for lines. Those findings compatible being triple system composed non-interacting late orbiting larger than 1000 days. amplitude line-profile variability reaches 7-8% line intensity seems related to 0.04 periodic photometric variation. Large wind density structures possible origin this variability, but not sufficient verify this. Our analysis that, should three be bound, they would coeval an age about 5.9+/-1.4 Myrs. distance is estimated 3.4+/-0.5 kpc. Their dynamical masses 14.3+/-0.1 10.3+/-0.1 M_sol. Using rotating, single evolutionary tracks, we estimate their initial 18+/-2 16+/-2 M_sol primary secondary, respectively. Regular monitoring required in future detect prove it gravitationally bound close O+OB determine its mass.