The First Hypervelocity Star from the LAMOST Survey
Abstract
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^(–1), which projects to a Galactocentric radial velocity component of ~477 km s^(–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_☉, 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.
Additional Information
© 2014 American Astronomical Society. Received 2014 January 20; accepted 2014 February 22; published 2014 April 2. Z.Z. thanks Youjun Lu, Qingjuan Yu, and Ben Bromley for helpful discussions. We thank the referee for a prompt and constructive report. This work is supported by the U.S. National Science Foundation (NSF), through grant AST-0937523. T.C.B. acknowledges partial support from U.S. NSF grant PHY 08- 22648. P.G. thanks the U.S. NSF for grant AST-1010039. Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences.Attached Files
Published - 2041-8205_785_2_L23.pdf
Submitted - 1401.5063v2.pdf
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Additional details
- Eprint ID
- 45949
- Resolver ID
- CaltechAUTHORS:20140528-151339346
- AST-0937523
- NSF
- PHY-0822648
- NSF
- AST-1010039
- NSF
- National Development and Reform Commission
- Created
-
2014-05-28Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)