Frequency analysis of Delta Scuti stars towards the Galactic bulge

Abstract

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

15 pages, 11 figures, 5 tables, submitted to MNRAS

References in corpus (2)

• KIC 10975348: A double-mode or triple-mode high-amplitude $\delta$ Scuti star?
• Searching for $\delta$ Scuti-type pulsation and characterising northern pre-main-sequence field stars

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• Modeling of multimode radially pulsating High-Amplitude Delta Scuti stars from the OGLE Galactic bulge sample
• $\delta$ Scuti pulsations in the bright Pleiades eclipsing binary HD 23642
• Period-Colour and Amplitude-Colour relations for OGLE-$\delta$ Scuti stars in the Galactic Bulge and LMC
• Observational Parameters of Blue Large-amplitude Pulsators
• Discovery of resonating integration modes in triple-mode high-amplitude $\delta$ Scuti stars: A new evolutionary phase indicator
• Exploring the unexpected: Disharmonized harmonic pulsation modes in high-amplitude $\delta$ Scuti stars
• Spectroscopic and Photometric Study of the new $\delta$ Scuti Star ASAS J063309+1810.8