Sgr A* Companion S0-2: A Probe of Very High-Mass Star Formation

Details Sgr A* Companion S0-2: A Probe of Very High-Mass Star Formation Sgr A* Companion S0-2: A Probe of Very High-Mass Star Formation

2003-02-20

arxiv.org/abs/astro-ph/0302437v1

Astrophys.J.592:935-940,2003

Astronomy and Astrophysics

Astrophysics

Submitted to ApJ, 12 pages including 2 figures

Scientific paper

10.1086/375840

The star S0-2, which is orbiting Sgr A* with a 15-yr period, almost certainly did not form in situ. We propose that it was injected into this close orbit by the tidal disruption of a massive-star binary, whose primary was more massive than S0-2 and at least 60 Msun. From numerical integrations we find that 1-2% of incoming binaries with closest approach equal to 130 AU leave the secondary in an orbit with eccentricity within 0.01 of that of SO-2. If additional stars are found orbiting Sgr A* with relatively short periods, they could be used to probe the formation of massive stars in the Galactocentric region, even though the massive stars themselves have long since perished.

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