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Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV

Pietrukowicz P., Soszyński I., Netzel H., Wrona M., Udalski A., Szymański M. K., Poleski R., Kozłowski S., Skowron J., Ulaczyk K., Skowron D. M., Mróz P., Rybicki P., Iwanek P., Gromadzki M.

Acta Astronomica

2020

Vol. 70, No. 4

241--263

We present a collection of 10 111 genuine δ Sct-type pulsating variable stars detected in the OGLE-IV Galactic bulge fields. In this sample, 9835 variables are new discoveries. For most of the stars photometric data cover the whole decade 2010-2019. We illustrate a huge variety of light curve shapes of δ Sct variables. Long-term observations have allowed us to spot objects with evident period, amplitude, and mean brightness variations. Our analysis indicates that about 28% of the stars are single-mode pulsators. Fourteen δ Sct stars show additional eclipsing or ellipsoidal binary modulation. We report significant attenuation or even disappearance of the pulsation signal in six sources. The whole set of variables is a mix of objects representing various Milky Way's populations, with the majority of stars from the Galactic bulge. There are also representatives of the Sagittarius Dwarf Spheroidal Galaxy. Some of the newly detected variables could be SX Phe-type stars residing in globular clusters. The collection, including full V- and I-band time-series data, is available to the astronomical community from the OGLE On-line Data Archive.