delta Scuti stars in TESS cycle-4

We first analyzed the relation between pulsation and stellar parameters from TESS observations and the distribution of delta stars with two different stellar parameters, TESS Input Catalog (TIC) and Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), within the classical instability strip. Most of the stars lie within the instability strip and follow the period-luminosity relation of delta stars. Additionally, the majority of the stars exhibit pulsation properties consistent with those expected for delta stars, including periods falling within the typical range, amplitudes at the millimagnitude level, and fundamental parameters such as spectral type, effective temperature, log g, and luminosity that match the characteristics of delta stars.

This confirms the reliability of the delta stars we have identified. We subsequently obtained the large frequency separation {DELTA}{nu}, {nu}_max_, and {nu}_Amax_ for 179 delta stars with LAMOST parameters by using an empirical relation and a 2D autocorrelation method, and obtained the relations between these asteroseismic indices. These stars will provide significant support for a deeper study of the internal structure and evolution of stars.