Variability analysis of δ Scuti candidate stars
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š.; Minkevičiūtė, R.; Bagdonas, V.; Pakštienė, E.; Janulis, R.; Klebonas, L.
Lithuania, Germany
Abstract
The Hipparcos catalogue contains stars suspected to be δ 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 Molėtai Astronomical Observatory (MAO, Lithuania) of thirteen δ 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 δ Scuti-type stars. Five of them may be hybrid δ Scuti-≳mma Doradus pulsators. One more candidate is a variable star with longer periods of pulsations which are intrinsic to ≳mma Doradus-type pulsators.