Orbital solution for the MACHO*05 : 34 : 41.3-69 : 31 : 39 O3 If*+O6 : V eclipsing binary system in the Large Magellanic Cloud

An orbital solution for the MACHO*05:34:41.3-69:31:39 eclipsing binary syst em is presented, based on the published light curve and spectral data obtai ned with the 2.15-m telescope at CASLEO. Based on these spectroscopic obser vations, the binary components of this system were classified as O3 If* and O6:V respectively. The radial velocity data along with the published light curve were analysed with the Wilson-Devinney code to derive the following masses and radii for the components of this system: M-1=41 +/-1.2 M-., R-1= 9.6 +/-0.02 R-., M-2=27 +/-1.2 M-. and R-2=8.0 +/-0.05 R-.. The solution sh ows that the system is in overcontact, as one would expect from the derived masses and the very short orbital period (similar to1.4 d).