The OGLE Collection of Variable Stars: Over 18 000 Rotating Variables toward the Galactic Bulge
Abstract
Stellar rotation, a key factor influencing stellar structure and evolution, also drives magnetic activity, which is manifested as spots or flares on stellar surface. Here, we present a collection of 18 443 rotating variables located toward the Galactic bulge, identified in the photometric database of the Optical Gravitational Lensing Experiment (OGLE) project. These stars exhibit distinct magnetic activity, including starspots and flares. With this collection, we provide long-term, time-series photometry in Cousins I- and Johnson V-band obtained by OGLE since 1997, and basic observational parameters, i.e., equatorial coordinates, rotation periods, mean brightness, and brightness amplitudes in both bands. This is a unique dataset for studying stellar magnetic activity, including activity cycles.
Cite
@article{arxiv.2406.18728,
title = {The OGLE Collection of Variable Stars: Over 18 000 Rotating Variables toward the Galactic Bulge},
author = {P. Iwanek and I. Soszyński and K. Stępień and S. Kozłowski and J. Skowron and A. Udalski and M. K. Szymański and M. Wrona and P. Pietrukowicz and R. Poleski and P. Mróz and K. Ulaczyk and D. M. Skowron and M. Gromadzki and K. Rybicki and M. J. Mróz and M. Ratajczak},
journal= {arXiv preprint arXiv:2406.18728},
year = {2024}
}
Comments
Accepted for publication in Acta Astronomica vol. 74. 24 pages, 12 figures, 4 tables. The OGLE Collection of rotating variables toward the Galactic bulge is publicly available through https://www.astrouw.edu.pl/ogle/ogle4/OCVS/blg/rot/