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The OGLE Collection of Variable Stars

Over 2600 δ Scuti Stars in the Small Magellanic Cloud

I. Soszyński, A. Udalski, J. Skowron, P. Pietrukowicz, M. K. Szymański, R. Poleski, D. M. Skowron, S. Kozłowski, P. Mróz, P. Iwanek, M. Wrona, K. Ulaczyk, K. Rybicki, and M. Gromadzki
Acta Astronomica, 72, 245 (arXiv:2301.04663)
Data download: OCVS/SMC/DSCT

We present the first-ever collection of δ Scuti stars found over the entire area of the Small Magellanic Cloud (SMC). The sample consists of 2810 variables of which over 2600 objects belong to the SMC while the remaining stars are most likely members of the Milky Way's halo. The sample has been divided into 2733 singlemode and 77 multimode pulsators.

Example I-band and V-band light curves of delta Scuti stars in the SMC

We provide observational parameters (pulsation periods, mean magnitudes, amplitudes, Fourier coefficients) of all δ Sct stars and the long-term I- and V-band time-series photometric measurements collected during the fourth phase of the Optical Gravitational Lensing Experiment (OGLE-IV).

Period-luminosity diagram for classical pulsating stars in the SMC

OGLE photometric data are available to the astronomical community from the OGLE Internet Archive and through the on-line search form in the OGLE Collection of Variable Stars.

PLEASE cite the following paper when using the data or referring to these OGLE results:
Soszyński et al., 2022, Acta Astronomica, 72, 245, (arXiv:2301.04663)

Any comments about the data and the form of their presentation are welcome as they can improve the future releases of OGLE analysis. Send your messages to this address.