【摘要】 在Sloan数字巡天计划第二批释放的数据中选择了15257个面向的盘状星系,统计研究它们的颜色星等关系．结果表明3个颜色g-r、r-i、r-z均与r波段的绝对星等有紧密的相关关系,即:越亮的星系,颜色越红,而且色指数弥散越小．并且简单讨论了观测到的颜色星等关系对盘状星系的恒星形成历史的约束．更多还原

【Abstract】 We choose 15257 face-on disk galaxies from Data Release 2 of Sloan Digital Sky Survey and statistically investigate their color magnitude relations．It is shown that the color g-r,r-i,r-z have tight relations with r-band magnitude,i.e.,more luminous galaxies have redder colors than less luminous galaxies．and their relations have less dispersion．In the end,the implications of the observed color-magnitude relations on the star formation history of disk galaxy are discussed．更多还原