Cl* NGC 2539 CKY V3 and V4 BV light curves
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https://b2find.eudat.eu/dataset/09965707-da36-57cd-8408-fce932cc7c65
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资源简介：
CCD photometric observations of the eclipsing contact binaries (EW type) V3 and V4 of the cluster NGC 2539 were made in the B and V bands using the 2m telescope at the...
