We performed UBVRI
differential photometry on the stars YYOri, SYOri,
CEOri, NSOri and XXOri.
The observations took place at the 1 m
telescope of the Wise Observatory in Mizpe Ramon (Israël) from 1996
November 23 to December 2 and from December 23 to 1997
January 2. Additional photometric observations in the R and V band were
obtained by S. Allain and H. Geoffray for the star YYOri at the 120 cm
telescope of the Observatoire de Haute-Provence (France)
in the period between December 2 and December 15.
A 1024 
1024 pixel CCD detector was used in both cases to image a
field of view of about 12 12 arcmin.
The magnitude of the target star was compared to the average magnitude of a
sample of comparison stars on the same CCD frame. Comparison stars were
chosen as described in a previous paper (Bertout et al. 1996) to which we refer the reader for additional detail on the data reduction procedure.