Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-21
Astronomy and Astrophysics
Astrophysics
4 pages, 5 figures, ApJ letters accepted
Scientific paper
10.1086/526768
We analyze the properties of the star S2 orbiting the supermassive black hole at the center of the Galaxy. A high quality SINFONI H and K band spectrum obtained from coadding 23.5 hours of observation between 2004 and 2007 reveals that S2 is an early B dwarf (B0-2.5V). Using model atmospheres, we constrain its stellar and wind properties. We show that S2 is a genuine massive star, and not the core of a stripped giant star as sometimes speculated to resolve the problem of star formation so close to the supermassive black hole. We give an upper limit on its mass loss rate, and show that it is He enriched, possibly because of the presence of a magnetic field.
Eisenhauer Frank
Genzel Reinhard
Gillessen Stefan
Martins Fabrice
Ott Th.
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