利用北京天文台兴隆观测基地2.16米望远镜的折轴阶梯光栅摄谱仪，获得了一批中等贫金属星的高分辨率、高信噪比光谱。
The high resolution , high signal to noise ratio spectra of a sample of mildly metal-poor stars were obtained with the Coude Echelle Spectrograph attached to the 2.16m telescope at Beijing Astronomical Observatory ( Xinglong , China ) .
折轴摄谱仪