Discovery of an M8.5 Dwarf With Proper Motion mu=2.38 arcsec/yr
Abstract
We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper motion (mu=2.38 arcsec/yr). A low resolution red spectrum reveals that LSR1826+3014 is an ultra-cool red dwarf with spectral type M8.5 V and with a radial velocity v_rad=+77+/-10 km/s. LSR1826+3014 is thus the faintest red dwarf ever discovered with a proper motion larger than 2 arcsec/yr. Optical and infrared photometry suggest that the star is at a distance d=13.9+/-3.5 pc from the Sun, which implies it is moving relative to the local standard of rest with a total velocity of 175+/-25 km/s. Numerical integration of its orbit suggests that LSR1826+3014 is on a halo-like galactic orbit.
Cite
@article{arxiv.astro-ph/0211146,
title = {Discovery of an M8.5 Dwarf With Proper Motion mu=2.38 arcsec/yr},
author = {Sebastien Lepine and R. Michael Rich and James D. Neill and Adeline Caulet and Michael M. Shara},
journal= {arXiv preprint arXiv:astro-ph/0211146},
year = {2009}
}
Comments
12 pages, including 1 table and 3 figures, accepted for publication in The Astrophysical Journal Letters