Nearby Low-Mass Hypervelocity Stars
Astrophysics of Galaxies
2015-09-25 v1
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.
Keywords
Cite
@article{arxiv.1501.07824,
title = {Nearby Low-Mass Hypervelocity Stars},
author = {Yanqiong Zhang and Martin C. Smith and Jeffrey L. Carlin},
journal= {arXiv preprint arXiv:1501.07824},
year = {2015}
}
Comments
5 pages; Contribution to proceedings for "The Milky Way Unravelled by Gaia" conference, Barcelona, Dec 2015