Robo-AO observed cool subdwarf companions

Cool subdwarfs are the oldest members of the low-mass stellar population. Mostly present in the galactic halo, subdwarfs are characterized by their low-metallicity. Measuring...冷亚矮星（Cool subdwarfs）是低质量恒星族群中最古老的成员。该类天体大多分布于银晕（galactic halo）中，以低金属丰度（low-metallicity）为典型特征。相关测量……