Nearby Low-Mass Hypervelocity Stars
Yanqiong Zhang, Martin C. Smith, Jeffrey L. Carlin
TL;DR
This paper identifies potential low-mass hypervelocity stars using SDSS data and spectroscopy, highlighting one candidate likely escaping the Milky Way, though uncertainties remain due to unknown metallicities.
Contribution
It presents a new method combining SDSS data and spectroscopy to identify low-mass hypervelocity star candidates in the Milky Way.
Findings
Four strong hypervelocity star candidates identified.
One candidate has a high likelihood of escaping the Milky Way.
Metallicity uncertainties affect distance and velocity estimates.
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.
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