HST photometry of Cepheid candidates in M101
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The impact of metallicity on the Cepheid period-luminosity (P-L) relation is investigated using Hubble Space Telescope Advanced Camera for Surveys V and I images of M101....
本研究利用哈勃空间望远镜（Hubble Space Telescope）高级巡天相机（Advanced Camera for Surveys）获取的M101的V波段与I波段图像，对金属丰度（metallicity）对造父变星（Cepheid）周光（P-L）关系的影响展开了探究。……
