TIC 308396022: <i>?</i> Scuti–<i>?</i> Doradus hybrid with large-amplitude radial fundamental mode and regular <i>g</i>-mode period spacing

We analyse the pulsating behaviour of TIC 308396022, based on observations by TESS mission. The star is a high-amplitude ? Sct that shows very rich amplitude spectrum using 3-yr light curve. Among these frequencies, strongest peak f 1 = 13.20362567(12) d ?1 identified as radial fundamental mode, and we also find first second overtones ( 2 3 ). In low-frequency range (&lt; 2.5 ), 22 peaks are gravity modes, which show regular period spacing about 2460 s have an angular degree l 1. pattern does not significant downward trend, suggesting rotating slowly. note this Sct– ? Dor hybrid containing mode g -mode pattern. With O ? C analysis, time delay, implying has companion it likely to be white dwarf. history possible mass transfer provides great opportunity for testing current theories binary evolution, transfer, pulsation.