Where are the Old-Population High Velocity Stars?

Details Where are the Old-Population High Velocity Stars? Where are the Old-Population High Velocity Stars?

2007-01-11

arxiv.org/abs/astro-ph/0701350v1

Astrophys.J.664:343-348,2007

Astronomy and Astrophysics

Astrophysics

Submitted to ApJ. 7 pages including 2 figures

Scientific paper

10.1086/518405

To date, all of the reported high velocity stars (HVSs), which are believed to be ejected from the Galactic center, are blue and therefore almost certainly young. Old-population HVSs could be much more numerous than the young ones that have been discovered, but still have escaped detection because they are hidden in a much denser background of Galactic halo stars. Discovery of these stars would shed light on star formation at the Galactic center, the mechanism by which they are ejected from it, and, if they prove numerous, enable detailed studies of the structure of the dark halo. We analyze the problem of finding these stars and show that the search should be concentrated around the main-sequence turnoff (0.3

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