GCIRS16SW: a massive eclipsing binary in the Galactic Center

F. Martins1, S. Trippe1, T. Paumard1, T. Ott1, R. Genzel1,2, G. Rauw3, F. Eisenhauer1, S. Gillessen1, H. Maness4, R. Abuter5

(1) MPE, Postfach 1312, D-85741, Garching, Germany
(2) Department of Physics, University of California, CA 94720, Berkeley, USA
(3) Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Ao\ut 17, B\at. B5c, 4000 Liège, Belgium
(4) Department of Astronomy, University of California, CA 94720, Berkeley, USA
(5) ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany

Paper: ApJL, accepted

EPrint Server: astro-ph/0608215


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 He i 2.112 mu m 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.

Preprints available from the authors at martins@mpe.mpg.de , or the raw TeX (no figures) if you click here.

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