The Nearest High-Velocity Stars Revealed by LAMOST Data Release 1

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 solar neighborhood. The sufficiently accurate observed and derived parameters for all candidates allow us to ascertain their nature as genuine HVSs, while 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.

8 pages, 1 figure, 3 tables, accepted for publication in ApJ Letter

References in corpus (3)

• The Milky Way Tomography with SDSS: II. Stellar Metallicity
• The Nature of the Hyper-Runaway Candidate HIP 60350
• New release of the ELODIE library: Version 3.1

Cited by in corpus (17)

• Overview of the LAMOST survey in the first decade
• Maximum speed of hypervelocity stars ejected from binaries
• Relativistic effects on tidal disruption kicks of solitary stars
• Characterizing the High-Velocity Stars of RAVE: The Discovery of a Metal-Rich Halo Star Born in the Galactic Disk
• Discovery of two new hypervelocity stars from the LAMOST spectroscopic surveys
• 591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
• LAMOST observations in the Kepler field. Analysis of the stellar parameters measured with the LASP based on the low-resolution spectra
• Estimation of distances to stars with stellar parameters from LAMOST
• Core-Collapse Supernovae in Binaries as the Origin of Galactic Hyper-Runaway Stars
• Candidate hypervelocity stars of spectral type G and K revisited
• Constraints on the Galactic Centre environment from \textit{Gaia} hypervelocity stars III: Insights on a possible companion to Sgr A*
• Comparing hypervelocity star populations from the Large Magellanic Cloud and the Milky Way
• Constraints on the Galactic Centre environment from Gaia hypervelocity stars II: The evolved population
• Intermediate-Mass Black Holes in binary-rich star clusters
• The luminosity function of quasars by the Principle of Maximum Entropy
• Runaway Dwarf Carbon Stars as Candidate Supernova Ejecta
• Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria