Blue objects in the field of M31

This paper gives the results of a photometric study of star-like blue objects Nos. 14, 15, 16, 17, and 18 discovered by Börngenet al. (1970) in the field of M31 and of the QSO OA 33. Three of these objects-Nos. 14, 16 and 17-exhibit variable light. No. 14 is a probable U Geminorum-star; No. 16 is a QSO and very likely also the No. 17. Finally, we suggest a candidate for the optical counterpart of OA 33.