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Title: THE FIRST HYPERVELOCITY STAR FROM THE LAMOST SURVEY

We report the first hypervelocity star (HVS) discovered from the LAMOST spectroscopic survey. It is a B-type star with a heliocentric radial velocity of about 620 km s{sup –1}, which projects to a Galactocentric radial velocity component of ∼477 km s{sup –1}. With a heliocentric distance of ∼13 kpc and an apparent magnitude of ∼13 mag, it is the closest bright HVS currently known. With a mass of ∼9 M {sub ☉}, it is one of the three most massive HVSs discovered so far. The star is clustered on the sky with many other known HVSs, and its position suggests a possible connection to Galactic center structures. With the current poorly determined proper motion, a Galactic center origin of this HVS remains consistent with the data at the 1σ level, while a disk runaway origin cannot be excluded. We discuss the potential of the LAMOST survey to discover a large statistical sample of HVSs of different types.
Authors:
 [1] ; ;  [2] ;  [3] ; ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10]
  1. Department of Physics and Astronomy, University of Utah, UT 84112 (United States)
  2. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180 (United States)
  3. National Optical Astronomy Observatory, Tucson, AZ 85719 (United States)
  4. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  5. Spitzer Science Center, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  6. UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  7. Department of Physics and Astronomy, Georgia State University, 25 Park Place, Suite 605, Atlanta, GA 30303 (United States)
  8. Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
  9. University of Science and Technology of China, Hefei 230026 (China)
  10. Nanjing Institute of Astronomical Optics and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042 (China)
Publication Date:
OSTI Identifier:
22365894
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DISTANCE; MASS; MILKY WAY; POTENTIALS; PROPER MOTION; RADIAL VELOCITY; STARS