http://arxiv.org/abs/1401.5063
We report the first hypervelocity star (HVS) discovered from the LAMOST spectroscopic survey. It is a B-type star with a heliocentric radial velocity about 620 km/s, which projects to a Galactocentric radial velocity component of ~477 km/s. With a heliocentric distance of ~13 kpc and an apparent magnitude of ~13 mag, it is the nearest and brightest HVS currently known. With a mass of ~9Msun, it is very similar to HVS HE 0437-5439 in its stellar properties; the two stars are the most massive HVSs known so far. The star is clustered on the sky with many other known HVSs, with the position suggesting a possible connection to Galactic center structures. With the current poorly-determined proper motion, a Galactic center origin of this HVS remains consistent with the data at the 2-3sigma level. We discuss the potential of the LAMOST survey to discover a large statistical sample of HVSs of different types.
Wed, 22 Jan 14
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