Variability Analysis of δ Scuti Candidate Stars

The Hipparcos catalog contains stars suspected to be δ Scuti variables for which extensive ground-based observations and characterization of variability are necessary. Our aim was to characterize variability of 13 candidates to δ Scuti type stars. We obtained 24 215 CCD images and analyzed stellar light curves using the Period04 program. Twelve δ Scuti candidate stars have been characterized as pulsating with frequencies intrinsic to δ Scuti stars: HIP 2923, HIP 5526, HIP 5659, HIP 11090, HIP 17585, HIP 74155, HIP 101473, HIP 106219, HIP 107786, HIP 113487, HIP 115093, and HIP 115856. Five of them (HIP 2923, HIP 5526, HIP 11090, HIP 115856, and HIP 106219) may be hybrid δ Scuti-γ Doradus pulsators. One more candidate, HIP 106223, is a variable star with longer periods of pulsations which are intrinsic to γ Doradus.