APOGEE cool stars

The Galactic center region, including the nuclear disk, has until recently been largely avoided in chemical census studies because of extreme extinction and stellar crowding....包括星系核盘（nuclear disk）在内的银河系中心区域，直至近期仍因极强的星际消光与恒星拥挤现象，在化学普查研究中很大程度上未被纳入研究范畴……