The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. VI. Delta Scuti Stars in the Large Magellanic Cloud

TL;DR

This paper presents a comprehensive catalog of 2786 Delta Scuti variable stars in the Large Magellanic Cloud from the OGLE-III survey, including multi-mode pulsators and analysis of their pulsation modes.

Contribution

It provides the largest catalog of Delta Scuti stars in the LMC with detailed mode classifications and identifies multi-mode pulsators, enhancing understanding of stellar pulsations.

Findings

2786 Delta Scuti stars identified

92 multi-mode pulsators discovered

Most single-mode stars likely pulsate in the first overtone

Abstract

The sixth part of the OGLE-III catalog of Variable Stars presents \delta Sct pulsators in the Large Magellanic Cloud. Altogether 2786 variable stars were found and amongst them 92 are multi-mode objects, including 67 stars pulsating in the fundamental mode and the first overtone (F/1O), nine double-mode pulsators with various combinations of the first three overtones excited (1O/2O, 2O/3O and 1O/3O pulsators), and two triple mode (F/1O/2O) \delta Sct stars. In total 1490 of stars are marked as uncertain, due to scattered photometry and small amplitudes. For single-mode objects it was not possible to unambiguously identify pulsation mode, however we suggest the most of the single-mode variable stars pulsate in the first overtone.