GCIRS16SW: a massive eclipsing binary in the Galactic Center
  We report on the spectroscopic monitoring of GCIRS16SW, an Ofpe/WN9 star and LBV candidate in the central parsec of the Galaxy. SINFONI observations show strong daily spectroscopic changes in the K band. Radial velocities are derived from the HeI 2.112 um line complex and vary regularly with a period of 19.45 days, indicating that the star is most likely an eclipsing binary. Under various assumptions, we are able to derive a mass of ~ 50 Msun for each component. 
F. Martins (1), S. Trippe (1), T. Paumard (1), T. Ott (1), R. Genzel   (1 and 2), G. Rauw (3), F. Eisenhauer (1), S. Gilless...