The origins of stars of differing spectraltypes must be dissimilar.
不同光谱型星的起源必然是不一样的。
2
A convenient classification of stars is based upon the observed sequence of spectraltypes.
一种实用的恒星分类法是基于测得的光谱类型序列。
3
In order to obtain higher measured accuracy of star's positions by the low-latitude meridian circle, it is needed to measure the astronomical refraction to the stars of different spectraltypes.