Paper: astro-ph/0510574
Date: Wed, 19 Oct 2005 19:56:27 GMT (104kb)

Title: The Fate of Former Companions to Hypervelocity Stars Originating at the
Galactic Center

Authors: Idan Ginsburg, Abraham Loeb (Harvard U.)

Comments: Submitted to MNRAS
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The hypervelocity star SDSS J090745.0+024507 in the halo of the Milky Way
galaxy (Brown et al. 2005) most likely originated from the breakup of a binary
star system by the central black hole, SgrA* (Hills 1988). We examine the fate
of former binary companions to similar hypervelocity stars (HVSs) by simulating
600 different binary orbits around SgrA* with a direct N-body integration code.
For some orbital parameters, the binary breakup process leads to HVSs with
ejection velocities that are almost an order of magnitude larger than the
velocity observed for SDSS J090745.0+024507. The former companion stars
populate highly eccentric orbits which resemble the observed orbits for some of
the stars nearest to SgrA*.

\\ ( http://arXiv.org/abs/astro-ph/0510574 , 104kb)