Cepheus OB3 association: faint members

Abstract

From UBVRI-CCD photometry in the region of Cepheus OB3 association previously published by the authors, a search for faint members was performed. Colour-colour and colour-magnitude calibrations were used to estimate individual reddenings and distances. The comparison between these individual values and the average values for the known member stars led to a list of member candidates. Candidate members birhter than V = 14 mag were observed in the ubvy-beta system to confirm or deny their membership. Members down to V = 13.6 mag were found. The ages of the association subgroups were found to be 5.5 and 7.5 Myr.