Variability Census of Legacy Catalogs. IV. 3600+ New <i>δ</i> Scuti and <i>γ</i> Doradus Stars

Abstract This study identifies over 1490 new δ Scuti and 2206 new γ Doradus stars. These discoveries result from the fourth phase of a variability census of A-F stars in the HD and SAO catalogs, excluding those cross-matched with the PPM catalog. Across four project phases, I have checked the Transiting Exoplanet Survey Satellite (TESS) light curves for 110,152 A-F stars selected from PPM, HD, and SAO catalogs. This comprehensive survey has now identified over 11,180 δ Scuti, 9886 γ Doradus, and 1342 eclipsing binaries, along with thousands of other variable types. Notably, over 2712 of these variables exhibit hybrid δ Sct- γ Dor pulsations, and more than 198 eclipsing binaries contain pulsating ( δ Sct or γ Dor) primary components. Using TESS data, this work has revealed a significant population of previously undetected variable stars, essential for stellar and asteroseismic studies due to their relatively bright nature.