The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds

TL;DR

This paper presents a catalog of 991 heartbeat star candidates identified in the OGLE data, including their properties, classifications, and orbital parameters, enhancing understanding of these pulsating binary systems in the Galactic bulge and Magellanic Clouds.

Contribution

The study provides the first large, detailed catalog of heartbeat stars with extensive photometry and orbital data, distinguishing two main groups based on stellar evolution status.

Findings

Identified 991 heartbeat star candidates across the Galactic bulge and Magellanic Clouds.

Classified the stars into two groups: hot main-sequence/Hertzsprung-gap and red giant primaries.

Provided two-decade-long photometric data and orbital parameters for each star.

Abstract

We present a collection of 991 heartbeat star (HBS) candidates found in the Optical Gravitational Lensing Experiment (OGLE) project data archive. We discuss the selection process of the HBS candidates and the structure of the catalog itself. It consists of 512 stars located toward the Galactic bulge (GB), 439 stars located in the Large Magellanic Cloud (LMC), and 40 in the Small Magellanic Cloud (SMC). The collection contains two large groups of HBSs with different physical properties. The main distinction between the two groups is the evolutionary status of the primary star. The first group of about 100 systems contains a hot main-sequence (MS) or a Hertzsprung-gap primary star, while the second group of about 900 systems includes a red giant (RG). For each star, we provide two-decade-long time-series photometry, in the Cousins $I$- and Johnson $V$-band filters, obtained by the OGLE project. We also present basic observational information as well as orbital parameters derived from the light curve modeling.