The nearest High-Velocity stars revealed by LAMOST data release 1

Li CHEN, Jing ZHONG, Jinliang HOU, Zhenyi SHAO, et al. (SHAO, Shanghai, P.R.China)

We report the discovery of 28 candidate high-velocity stars (HVSs) at heliocentric distances of less than 3 kpc,based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 1. Our sample of HVS candidates covers a much broader color range than the equivalent ranges discussed in previous studies and comprises the first and largest sample of HVSs in the immediate solar neighborhood. Our results also highlight the great potential of discovering statistically large numbers of HVSs of different spectral types in LAMOST survey data. This will ultimately enable us to achieve a better understanding of the nature of Galactic HVSs and their ejection mechanisms, and to constrain the structure of the Galaxy.