The eclipsing binary systems with ? Scuti component – II. AB Cas

We present a complex study of the eclipsing binary system, AB Cas. The analysis whole TESS light curve, corrected for effects, reveals 112 significant frequency peaks with 17 independent signals. dominant $f_1 = $17.1564 d$^{-1}$ is radial fundamental mode. $O-C$ times minima from over 92 years leads to conclusion that due ongoing mass transfer system exhibits change orbital period at rate 0.03 s per year. In order find evolutionary models describing current stage Cas, we perform evolution computations. Our results show Cas as product rapid non-conservative about 5-26 % transferred lost system. This process heavily affected characteristics this and its components in past. fact, closely resembles formation scenarios EL CVn type binaries. For first time, demonstrate effect on pulsations determine lines constant HR diagram. From seismic modelling, obtain constraints various parameters. particular, constrain overshooting parameter, $f_{\rm ov}\in [0.010,~0.018]$, mixing-length $\alpha_{\rm MLT}\in[1.2,~1.5]$ age, $t \in [2.3,~3.4]$ Gyr.