Open star clusters. I. NGC 581 (M 103)
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We present CCD photometry and a proper motion study of the young open star cluster, NGC 581 (M 103). Fitting isochrones to the colour magnitude diagram, we found an age of...
本研究针对年轻疏散星团NGC 581(又称M 103)开展了CCD测光(CCD photometry)与自行(proper motion)研究。通过将等时线拟合至颜色-星等图,我们得到该星团的年龄为……



