Light curve shape variability of SZ Cassiopeiae between 1978-1994

The aim of our investigation was to approach the problem of identification for possible variability of light curve shape in case of the classical Ceph eid SZ Cassiopeiae. In order to perform such a study we analysed eight obse rvational data sets obtained through V photoelectrical photometry, covering a time base of 16 years. We applied the Fourier decomposition technique to each data set; the obtained Fourier coefficients were used to calculate th e corresponding amplitude ratios and phase differences. Their time behavior were finally studied in order to search for evidences of the variability o f the light curve shape.