Astrophys. J., 647, 303-311 (2006/August-2)
Hypervelocity stars. I. The spectroscopic survey.
BROWN W.R., GELLER M.J., KENYON S.J. and KURTZ M.J.
Abstract (from CDS):
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, 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]Wk=-1.3 and velocity dispersion 108±5 km/s. 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.
Galaxies: Individual: Name: Leo A - Galaxies: Individual: Name: Draco - Galaxy: Halo - Galaxy: Stellar Content - Stars: Horizontal-Branch - Stars: White Dwarfs
VizieR on-line data:
<Available at CDS (J/ApJ/647/303): table1.dat table2.dat table3.dat>
Table 1: [BGK2006] HV N (Nos 6-7) added. Table2, 3: [BGK2006] JHHMMSS.ss+DDMMSS.s N=202+44.
Parag 6.2 : SDSS J172004.07+575110.8 = [BS61] 517
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