A complete MK designation includes both spectraltype and luminosity class -for instance, the sun is a G2V.
一个完整的MK系统代号包含光谱类型和光度型两部分——例如，太阳属于G 2 V类恒星。
2
The appearance of the different spectraltype for white dwarfs depends mainly on the difference in temperature and internal mixing degree.
白矮星不同光谱型的表现，主要是由于温度的不同和内部混搅程度的不同引起的。
3
The hertzsprung - russell diagram serves this purpose . it is a plot of absolute magnitude against surface temperature i . e . , spectraltype of stars.