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doi: 10.32023/0001-5237/72.4.1

Vol. 72 (2022), No. 4

pp. 245-256

The OGLE Collection of Variable Stars. Over 2600 δ Scuti Stars in the Small Magellanic Cloud

I. Soszyński¹, A. Udalski¹, J. Skowron¹, P. Pietrukowicz¹, M.K. Szymański¹, R. Poleski¹, D.M. Skowron¹, S. Kozłowski¹, P. Mróz¹, P. Iwanek¹, M. Wrona¹, K. Ulaczyk^2,1, K. Rybicki^3.1 and M. Gromadzki^1
1Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
²Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
³Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel


Received: December 27, 2022


ABSTRACT

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 single mode and 77 multimode pulsators. 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).

Key words: Stars: variables: delta Scuti - Stars: oscillations - Magellanic Clouds - Catalogs

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