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.
@article{arxiv.astro-ph/0608215,
title = {GCIRS16SW: a massive eclipsing binary in the Galactic Center},
author = {F. Martins and S. Trippe and T. Paumard and T. Ott and R. Genzel and G. Rauw and F. Eisenhauer and S. Gillessen and H. Maness and R. Abuter},
journal= {arXiv preprint arXiv:astro-ph/0608215},
year = {2011}
}