The OGLE Collection of Variable Stars. Over 15 000 Delta Scuti Stars in the Large Magellanic Cloud
I. Soszy\'nski, P. Pietrukowicz, A. Udalski, J. Skowron, M. K., Szyma\'nski, R. Poleski, D. M. Skowron, S. Koz{\l}owski, P. Mr\'oz, P., Iwanek, M. Wrona, K. Ulaczyk, K. Rybicki, M. Gromadzki, M. Mr\'oz

TL;DR
This paper presents the largest collection of extragalactic delta Scuti stars from the OGLE project, including new binary candidates and detailed period-luminosity relations, advancing understanding of variable stars in the Large Magellanic Cloud.
Contribution
It provides the first extensive dataset of delta Scuti stars in the LMC, including binary candidates and refined period-luminosity relations, with implications for stellar evolution and distance measurements.
Findings
Largest sample of extragalactic delta Sct stars published
First candidates for binary systems with delta Sct components beyond the Milky Way
Identification of a non-linear period-luminosity relation with a break at 0.5 days
Abstract
We present the OGLE collection of delta Scuti stars in the Large Magellanic Cloud and in its foreground. Our dataset encompasses a total of 15 256 objects, constituting the largest sample of extragalactic delta Sct stars published so far. In the case of 12 delta Sct pulsators, we detected additional eclipsing or ellipsoidal variations in their light curves. These are the first known candidates for binary systems containing delta Sct components beyond the Milky Way. We provide observational parameters for all variables, including pulsation periods, mean magnitudes, amplitudes, and Fourier coefficients, as well as long-term light curves in the I- and V-bands collected during the fourth phase of the OGLE project. We construct the period-luminosity (PL) diagram, in which fundamental-mode and first-overtone delta Sct stars form two nearly parallel ridges. The latter ridge is an extension…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astronomy and Astrophysical Research
