标题： LAMOST 1: 天龙座中的一颗被瓦解的卫星天体 显示英文标题

标题： LAMOST 1: A Disrupted Satellite in the Constellation Draco

摘要： 利用LAMOST光谱数据，我们在天龙座发现了一个强共动星群信号。 该星群在轨道的远地点附近被观测到，距离太阳2.6千秒差距，金属丰度为-0.64 dex。 该系统表现为一个质量约为2.1E4个太阳质量、V波段绝对星等约为-3.6的流动物种群，起源未知。 其高金属丰度、弥散的物理结构以及偏心轨道可能表明其前身卫星是一个球状星团，而不是矮星系或疏散星团。 显示英文摘要

摘要： Using LAMOST spectroscopic data, we find a strong signal of a comoving group of stars in the constellation of Draco. The group, observed near the apocenter of its orbit, is 2.6 kpc from the Sun with a metallicity of -0.64 dex. The system is observed as a streaming population of unknown provenance with mass of about 2.1E4 solar masses and an absolute V band magnitude of about -3.6. Its high metallicity, diffuse physical structure, and eccentric orbit may indicate that the progenitor satellite was a globular cluster rather than a dwarf galaxy or an open cluster.