Blue Large-Amplitude Pulsators and Other Short-Period Variable Stars in the OGLE-IV Galactic Disk Fields
J. Borowicz1, P. Pietrukowicz1, P. Mróz1, I. Soszyński1,
A. Udalski1, M.K. Szymański1, K. Ulaczyk2,
R. Poleski1, S. Kozłowski1, J. Skowron1,
D.M. Skowron1, K. Rybicki1,3, P. Iwanek1,
M. Wrona1, and M. Gromadzki1
1Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
2Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
Received: July 1, 2023
ABSTRACT
Blue Large-Amplitude Pulsators (BLAPs) form a mysterious
class of variable stars with typical periods of tens of minutes and
amplitudes above 0.1 mag. In this work, we present results of a
variability search focused on timescales shorter than 1 h, conducted
in OGLE-IV Galactic disk fields containing about 1.1 billion stellar
sources down to I≈20 mag. Twenty-five BLAPs have been
detected, 20 of which are new discoveries. Their periods range from
8.4 min to 62.1 min. We have also found six new eclipsing binary
systems with orbital periods from 38.3 min to 121.3 min and five
short-period large-amplitude (> 0.17 mag in the I-band)
variable stars of unknown type.
Key words:
Stars: oscillations - binaries: eclipsing
Full article text (PDF)
back
