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We utilize the PAdova and TRieste Stellar Evolution Code (PARSEC) combined with photometric observations to determine a guaranteed mass of AL Cas and re-examine its related physical parameters. Multicolor-photometric observations of AL Cas have been performed in 2016 and 2017. We use the Wilson-Devinney (W-D) code to analyze the light curves and find that AL Cas is probably an A-subtype contact binary ( f  = 35.7±0.9%) with a mass ratio  q  = 0.6399±0.0230 and an effective temperature difference Δ T  = 78 K. The mass-radius relation of a higher luminosity component for AL Cas is obtained by two methods: depending on calculation of the Roche lobe (DCRL method) and depending on calculation of the W-D code (DCWD method). Using this relationship with the PARSEC model, we investigate the component masses of AL Cas as  M 1  = 1.19±0.23  M ⊙  with  M 2  = 0.76±0.18  M ⊙  by the DCRL method and  M 1  = 1.22±0.26  M ⊙  with  M 2  = 0.78±0.20  M ⊙  by the DCWD method. By means of the photometric studies, we examine the related physical properties of AL Cas with the latest findings. We update the orbital period ( P orb  = 0.50055593 d) of AL Cas according to six new times of light minimum together with those collected from the literature. Meanwhile, the ( O  –  C ) 2  curve analysis suggests that the orbital period of AL Cas has a cyclic variation with a period of 81.25 yr and an amplitude of 0.01415 d. This cyclic change would be caused by the light-travel time effect from a third body. A similar mass of the third body ( M 3  sin  i ′ = 0.279  M ⊙ ) is derived from our two methods.

From multicolor-photometric observations to a guaranteed mass of AL Cas