Blue Large-Amplitude Pulsators and Other Short-Period Variable Stars in OGLE-IV Fields of the Outer Galactic Bulge

• Autorzy: Borowicz, J. , Pietrukowicz, P. , Skowron, J. , Soszyński, I. , Udalski, A. , Szymański, M. K. , Ulaczyk, K. , Poleski, R. , Kozłowski, S. , Mróz, P. , Skowron, D. M. , Rybicki, K. , Iwanek, P. , Wrona, M. , Gromadzki, M. , Mróz, M. J.
• Języki publikacji: EN

Abstrakty

EN

In this work, we search the OGLE-IV outer Galactic bulge fields for short-period variable objects. The investigation focuses on unexplored timescales roughly below one hour in an area containing about 700 million stellar sources down to I≈20 mag. We concentrate mainly on Blue Large-Amplitude Pulsators (BLAPs), which represent a recently discovered enigmatic class of short-period hot subluminous stars. We find 33 BLAPs in the period range from 7.5 min to 66.5 min. Thirty-one of them are new discoveries, which increases the number of known stars of this class to over one hundred. Additional eighteen objects with pulsation-like light curve shapes and periods ranging from 17.3 min to 53.7 min are presented. Very likely, these are δSct/SX Phe-type stars, but some of them could be pulsating hot subdwarfs or BLAPs. We also report on the detection of five eclipsing binary systems with orbital periods between 61.2 min and 121.9 min and three mysterious variable objects with I-band amplitudes larger than 0.9 mag. A spectroscopic follow-up would help in the final classification of the variables.

Słowa kluczowe

EN

stars: oscillations; stars: variables: general; binaries: eclipsing

• Czasopismo: Acta Astronomica
• Rocznik: 2023
• Tom: Vol. 73, No. 4
• Strony: 265--290
• Opis fizyczny: Bibliogr. 42 poz., rys., tab., wykr.

Twórcy

autor

Borowicz, J.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Pietrukowicz, P.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Skowron, J.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Soszyński, I.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Udalski, A.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Szymański, M. K.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Ulaczyk, K.

• Department of Physics, University of Warwick, Coventry CV4 7AL, UK

autor

Poleski, R.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Kozłowski, S.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Mróz, P.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Skowron, D. M.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Rybicki, K.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel

autor

Iwanek, P.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Wrona, M.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Gromadzki, M.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Mróz, M. J.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

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Identyfikatory

DOI

10.32023/0001-5237/73.4.2