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The First Hypervelocity Star from the LAMOST Survey

Zheng, Zheng and Carlin, Jeffrey L. and Beers, Timothy C. and Deng, Li-Cai and Grillmair, Carl J. and Guhathakurta, Puragra and Lépine, Sébastien and Newberg, Heidi Jo and Yanny, Brian and Zhang, Haotong and Liu, Chao and Jin, Ge and Zhang, Yong (2014) The First Hypervelocity Star from the LAMOST Survey. Astrophysical Journal Letters, 785 (2). Art. No. L23. ISSN 2041-8205. doi:10.1088/2041-8205/785/2/L23.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Carlin, Jeffrey L.0000-0002-3936-9628
Beers, Timothy C.0000-0003-4573-6233
Grillmair, Carl J.0000-0003-4072-169X
Guhathakurta, Puragra0000-0001-8867-4234
Lépine, Sébastien0000-0002-2437-2947
Yanny, Brian0000-0002-9541-2678
Liu, Chao0000-0001-7049-493X
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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Development and Reform CommissionUNSPECIFIED
Subject Keywords:Galaxy: center, Galaxy: disk, Galaxy: halo, Galaxy: kinematics and dynamics, stars: early-type, stars: individual (J091206.52+091621.8)
Issue or Number:2
Record Number:CaltechAUTHORS:20140528-151339346
Persistent URL:
Official Citation:The First Hypervelocity Star from the LAMOST Survey Zheng Zheng et al. 2014 ApJ 785 L23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45949
Deposited By: Ruth Sustaita
Deposited On:28 May 2014 22:30
Last Modified:10 Nov 2021 17:18

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