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One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds from the OGLE Survey

Marcin Wrona, Milena Ratajczak, Piotr A. Kołaczek-Szymański, Szymon Kozłowski, Igor Soszyński, Patryk Iwanek, Andrzej Udalski, Michał K. Szymański, Paweł; Pietrukowicz, Dorota M. Skowron, Jan Skowron, Przemek Mróz, Radosław Poleski, Mariusz Gromadzki, Krzysztof Ulaczyk, and Krzysztof Rybicki
The Astrophysical Journal Supplement Series, 256, 16 (arXiv:2109.14616)

Photometric Analysis of the OGLE Heartbeat Stars

Marcin Wrona, Piotr A. Kołaczek-Szymański, Milena Ratajczak, Szymon Kozłowski
The Astrophysical Journal, 928, 135 (arXiv:2109.14614)
Data download: OCVS/BLG/HB, OCVS/LMC/HB, OCVS/SMC/HB

We present a collection of 991 heartbeat star (HBS) candidates found in the Optical Gravitational Lensing Experiment (OGLE) project data archive. The HBSs are a subclass of ellipsoidal binaries on eccentric orbits. The name of this type of variable stars refers to a characteristic shape of the light curve, which is similar to an electrocardiogram signature. The catalog consists of 512 stars located toward the Galactic bulge, 439 stars located in the Large Magellanic Cloud, and 40 in the Small Magellanic Cloud.

The collection, including full I- and V-band time-series data, is available to the astronomical community from the OGLE On-line Data Archive under this link OCVS/HBSs.

Phase-folded light curves of HBSs
Examples of phase-folded light curves of HBSs from our collection. The orbital phase equal to 1.0 corresponds to the periastron passage, and P denotes the orbital period.

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 or a Hertzsprung-gap primary star, while the second group of about 900 systems includes a red giant.

Period--eccentricity (top panel) and period--ampltide (bottom panel) diagram for the OGLE HBSs located in the GB (circles) and in the MCs (triangles).
Period--eccentricity (top panel) and period--ampltide (bottom panel) diagram for the OGLE HBSs located in the Galactic bulge (circles) and in the Magellanic Clouds (triangles).

We also present a time-series analysis leading to detection of tidally excited oscillations (TEOs). We identify such pulsations in 52 of stars in the sample (5% of the entire collection) with a total of 78 different modes. This is the first relatively large and homogeneous sample of TEOs ever found.

Sample of HBSs with detected TEOs
Sample of HBSs with detected TEOs

PLEASE cite the following papers when using the data or referring to these OGLE results:
Wrona et al., 2022, The Astrophysical Journal Supplement Series, 256, 16 (arXiv:2109.14616)
Wrona et al., 2022, The Astrophysical Journal, 928, 135 (arXiv:2109.14614)

Any comments about the data and the form of their presentation are welcome as they can improve the future releases of OGLE analysis. Send your messages to this address.

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