CzeV293 and CzeV581—Two new high-amplitude double-mode delta Scuti stars

• Discovery of two new high-amplitude delta Scuti stars is presented.
• Frequency analysis showed that both stars are double-mode pulsators.
• Absolute magnitude, intrinsic colour index and temperature are estimated.

We report on the discovery of two high-amplitude double-mode delta Scuti stars in constellations of Hercules and Auriga. The stars were observed photometrically in five and two seasons, respectively. Frequency analysis revealed that both stars show complex pulsation behaviour with two independent modes and several combination peaks. Placing the stars into the Petersen diagram allowed us to identify the pulsation modes as the fundamental and the first overtone. Both stars follow the general trend for F/1O pulsators in the short-period part of the Petersen diagram and turned out to be classical members of HADS group of variables. Using empirical formulae we roughly estimate visual absolute magnitude, intrinsic (B−V)0(B−V)0 colour index and temperature of the target stars.