然后，借助多普勒成像技术得出了这两颗恒星的光球黑子活动区的结构，利用综合光谱减技术计算了它们的色球活动指标。
Then , we have obtained the structure of photospheric spot active regions for above two stars by using Doppler imaging technique , and their chromospheric activity indicators with the aid of synthesized spectral subtraction technique .
恒星光球