We present four colour CCD photometry of a field in M 31. Observations were
carried out in two broad band filters (V and i) and two special narrow ban
d "Wing" filters centered on a TiO and a CN molecular band. Colour-magnitud
e diagrams constructed from broad band photometry show the sequence of RGB/
BGB stars. Three known Cepheid variables could be identified on our frames.
We used colour-colour diagrams to identify the M- and C-type AGB stars and
to investigate e.g. the luminosity function of the AGB population. We foun
d 61 new extragalactic C-stars in this field of M 31.