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2011MNRAS.411.2596S - Mon. Not. R. Astron. Soc., 411, 2596-2614 (2011/March-2)
Ejection velocities of high Galactic latitude runaway stars.
SILVA M.D.V. and NAPIWOTZKI R.
Abstract (from CDS):
We find evidence for two different populations of runaway stars: a `high' velocity population, with a maximum ejection velocity of about 400-500 km/s, and a `low' velocity population, with a maximum ejection velocity of about 300 km/s. We argue that the observed limit of 500 km/s and the bimodality of the observed ejection velocity distribution are natural consequences of the so-called Binary Ejection Mechanism. We discuss the connection between the `high' velocity population and the so-called hypervelocity stars, showing how previously studied hypervelocity stars are consistent with the results obtained.
We also find that some stars that were once thought to be best explained as being formed in the halo are compatible with a runaway hypothesis once proper motions are included in the analysis. However, three stars in the selected sample appear to be inconsistent with ejection from the Galactic disc. Possible scenarios are discussed, including a possible formation in the Galactic halo.
Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): stars: early-type - stars: kinematics and dynamics - Galaxy: halo
VizieR on-line data: <Available at CDS (J/MNRAS/411/2596): tableb1.dat tableb2.dat refs.dat tableb3.dat tableb4.dat>
Simbad objects: 151
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