For a - early f type ms stars , stellar chromospheric activity decrease with stellar rotation period , but increase with rossby number ; for m type ms stars , stellar chromospheric activity increase with stellar rotation period and rossby number , and stellar chromospheric activity reach saturation at large color index ; for the ms stars between mid - f to m type , stellar chromospheric activity decrease with stellar rotation period and rossby number A ?早f型主序恒星的自转周期和恒星对流区的随色指数的分布明显地影响着这些恒星的色球活动行为。而m型主序星的色球活动水平基本上随自转参量的增大呈上升趋势，并且m型主序星的色球活动水平在色指数较大时趋于饱和。
