星等色指数图 magnitude-colour index diagram 星等-光谱型图(即赫罗图) magnitude-spectral type diagram 金牛座20;昴宿四 Maia (20 Tau) ..
双语例句
1
The hertzsprung - russell diagram serves this purpose . it is a plot of absolute magnitude against surface temperature i . e . , spectraltype of stars.