Abstract
We report the discovery of LSR 1826+3014, a very faint (V = 19.36) star with a very large proper motion (μ = 238 yr-1). A low-resolution red spectrum reveals that LSR 1826+3014 is an ultracool red dwarf with spectral type M8.5 V and with a radial velocity vrad = +77 ± 10 km s-1. LSR 1826+3014 is thus the faintest red dwarf ever discovered with a proper motion larger than 2'' yr-1. Optical and infrared photometry suggest that the star is at a distance d = 13.9 ± 3.5 pc from the Sun, which implies that it is moving relative to the local standard of rest with a total velocity of 175 ± 25 km s-1. The numerical integration of its orbit suggests that LSR 1826+3014 is on a halo-like Galactic orbit.
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