The nearest high-velocity stars revealed by LAMOST Data Release 1

Jing Zhong, Li Chen, Chao Liu, Richard De Grijs, Jinliang Hou, Shiyin Shen, Zhengyi Shao, Jing Li, Ali Luo, Jianrong Shi, Haotong Zhang, Ming Yang, Licai Deng, Ge Jin, Yong Zhang, Yonghui Hou, Zhenchao Zhang

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

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, at heliocentric distances less than 1-3 kpc. The observed as well as the derived parameters for all candidates are sufficiently accurate to allow us to ascertain their nature as genuine HVSs, of which a subset of 12 objects represents the most promising candidates. 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.

Original languageEnglish
Article numberL2
Number of pages7
JournalAstrophysical Journal Letters
Volume789
Issue number1
DOIs
Publication statusPublished - 1 Jul 2014
Externally publishedYes

Keywords

  • astrometry
  • Galaxy: halo
  • Galaxy: structure
  • stars: kinematics and dynamics
  • surveys

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