标题： 发现一颗自行 μ=2.38 角秒/年的M8.5矮星 显示英文标题

标题： Discovery of an M8.5 Dwarf With Proper Motion mu=2.38 arcsec/yr

摘要： 我们报告了 LSR1826+3014 的发现，这是一颗非常微弱（V=19.36）且具有极大自行（μ=2.38 角秒/年）的恒星。 低分辨率红光谱显示 LSR1826+3014 是一颗超冷红矮星，光谱类型为 M8.5 V，视向速度 v_rad=+77±10 公里/秒。 因此，LSR1826+3014 是迄今为止发现的最暗淡且自行大于 2 角秒/年的红矮星。 光学和红外测光表明该恒星距离太阳 d=13.9±3.5 秒差距，这意味着它相对于本动参考点以总速度 175±25 公里/秒运动。 其轨道数值积分表明 LSR1826+3014 沿着类似晕族轨道运行。 显示英文摘要

摘要： 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.