  CCD light curves of the Algol type eclipsing binaries DP Cep, AL Gem, FG Gem,
UU Leo, CF Tau and AW Vul were analysed using the Wilson-Deninney code and new
geometric and absolute parameters were derived. Due to cyclic apparent orbital
period changes of the systems, probably caused by the Light-Time Effect, the
contribution of a third light was taken into account in the light curve
solution. All the reliable timings of minima found in the literature were used
to study the period variations and search for the presence of a tertiary
component in the systems. A comparison between the parameters of the third body
derived from the light curve and orbital period analyses is also discussed.
Moreover, the absolute parameters of the eclipsing binary components were also
used to determine their current evolutionary state.
