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Published online by Cambridge University Press: 07 August 2017
Johnson UBVRI CCD-photometry was performed for 18 fields (3′×4.4′) in the association Cepheus OB3 using the 1.23m telescope of CAHA at Calar Alto (Almería, Spain). A total of 1055 stars was detected and the sample is complete down to V ≈ 19mag, although only 130 stars were measured with the five filters.