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Date and Time of the Query: 2019-05-22 T13:52:47 PDT
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For refcode 2006ApJ...647..303B:
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2006ApJ...647..303B Hypervelocity Stars. I. The Spectroscopic Survey Warren R. Brown, Margaret J. Geller, Scott J. Kenyon, and Michael J. Kurtz Abstract. We discuss our targeted search for hypervelocity stars (HVSs), stars traveling with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Our survey, now half-complete, has successfully identified a total of four probable HVSs plus a number of other unusual objects. Here we report the two most recently discovered HVSs: SDSS J110557.45+093439.5 and possibly SDSS J113312.12+010824, traveling with Galactic rest-frame velocities at least +508+/-12 and +418+/-10 km s^-1^, respectively. The other late B-type objects in our survey are consistent with a population of post-main-sequence stars or blue stragglers in the Galactic halo, with mean metallicity [Fe/H]_W_k__=-1.3 and velocity dispersion 108+/-5 km s^-1^. It is interesting to note that the velocity distribution shows a tail of objects with large positive velocities that may be a mix of low-velocity HVSs and high-velocity runaway stars. Our survey also includes a number of DA white dwarfs with unusually red colors, possibly extremely low mass objects. Two of our objects are B supergiants in the Leo A dwarf, providing the first spectroscopic evidence for star formation in this dwarf galaxy within the last ~30 Myr. Key words: Galaxies: Individual: Name: Leo A, Galaxies: Individual: Name: Draco, Galaxy: Halo, Galaxy: Stellar Content, Stars: Horizontal-Branch, Stars: White Dwarfs
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