Frequency analysis of ? Scuti stars towards the Galactic bulge

ABSTRACT We have performed a frequency analysis of 10 092 ? Scuti-type stars detected in the fourth phase Optical Gravitational Lensing Experiment towards Galactic bulge, which is most numerous homogeneous sample Scuti observed so far. The main goal was to search for pulsating at least two radial modes simultaneously. found 3083 candidates such stars, largest set obtained date. Among them, 2655 pulsate modes, 414 three and 14 four same time. report identification 221 fundamental mode, first overtone, third overtone show populated Petersen Bailey diagrams discuss statistical properties identified frequencies based on this sample. Additionally, we present theoretical predictions period ratios overtones from seventh.