Photometry of 3 open clusters
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To study the crucial range of Galactocentric distances between 12 and 16kpc, where little information is available, we have obtained VI CCD imaging of Berkeley 20 and BVI CCD...
为研究现有观测资料极为匮乏的12至16千秒差距银心距(Galactocentric Distances)关键区间,我们获取了伯克利20星团(Berkeley 20)的VI波段CCD成像与BVI波段CCD……



