Asteroseismology of a Double-mode High-amplitude δ Scuti Star TIC 448892817

Abstract We propose that TIC 448892817 is a double-mode high-amplitude δ Scuti star. The radial modes detected in this star provide unique opportunity to exploit asteroseismic techniques up their limits. 30 significant frequencies are by frequency analysis, while two of them independent frequencies, i.e., F0 = 13.43538(2) day −1 and F1 17.27007(4) . ratio f 1 / 2 measured be 0.777957(2), suggesting target Nearly all the light variation due these combination but several other very low amplitude also present. stellar evolutionary models were constructed with different mass M metallicity Z using Modules for Experiments Stellar Astrophysics (MESA). obtained model smaller than those observation. This might caused rotation pointing rotational effects more important previously thought HADS stars. something deserves investigated future works including moderate intermediate rotators such as FILOU. On hand, parameters from MESA agree well previous results observational spectra. best-fitting shows close entering first turnoff main sequence. In order accurately determine effective temperature metallicities, thus further narrowing parameter space star, we suggest high-resolution spectra highly desired future.