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Nearby Low-Mass Hypervelocity Stars

Published online by Cambridge University Press:  17 July 2015

Y.Q. Zhang ,
M.C. Smith  and
J.L. Carlin
Y.Q. Zhang*
Affiliation:
Shanghai Astronomical Observatory
M.C. Smith*
Affiliation:
Shanghai Astronomical Observatory
J.L. Carlin
Affiliation:
Rensselaer Polytechnic Institute, Troy & Earlham College, Richmond, USA
*
e-mail: [email protected]
e-mail: [email protected]
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Abstract

Hypervelocity stars are those that have speeds exceeding the escape speed and are hence unbound from the Milky Way. We investigate a sample of low-mass hypervelocity candidates obtained using data from the high-precision SDSS Stripe 82 catalogue, which we have combined with spectroscopy from the 200-inch Hale Telescope at Palomar Observatory. We find four good candidates, but without metallicities it is difficult to pin-down their distances and therefore total velocities. Our best candidate has a significant likelihood that it is escaping the Milky Way for a wide-range of metallicities.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 255 - 259
Copyright
© EAS, EDP Sciences, 2015

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