Variability Analysis of Δ Scuti Candidate Stars

The Hipparcos catalogue contains stars suspected to be delta Scuti variables for which extensive groundbased observations and characterisation of variability are desired. We obtained 24 215 CCD images with the 35/51 cm Maksutov-type robotic telescope at the Moletai Astronomical Observatory (MAO, Lithuania) of thirteen delta Scuti candidates selected from the Hipparcos catalogue in order to characterize their variability. We confirm that twelve of them are variables and pulsate with frequencies typical for delta Scuti-type stars. Five of them may be hybrid delta Scuti-gamma Doradus pulsators. One more candidate is a variable star with longer periods of pulsations which are intrinsic to gamma Doradus-type pulsators.