Comprehensive analysis of the eclipsing binaries V527 Dra and V2846 Cyg

Author:

Čeki Atila1ORCID,Şenavcı Hakan Volkan23ORCID,Latković Olivera1ORCID,Uzunçam Ebru23,Yorulmaz Eda Burcu23,Bahar Engin23

Affiliation:

1. Astronomical Observatory , Volgina 7, 11000 Belgrade , Serbia

2. Ankara University, Faculty of Science, Astronomy & Space Sciences Department , Tandoğan, TR-06100 Ankara , Türkiye

3. Ankara University, Astronomy and Space Sciences Research and Application Center (Kreiken Observatory) , İncek Blvd., TR-06837 Ahlatlıbel, Ankara , Türkiye

Abstract

ABSTRACT This is the first comprehensive study of the eclipsing binaries V527 Dra and V2846 Cyg, based on radial velocities and ground- and space-based light curves. We perform detailed modeling of these data to derive the absolute parameters and the orbital properties of the two systems. V527 Dra is found to be a semidetached, and V2846 Cyg a contact binary. Both show continual out-of-eclipse variations that can be explained by migrating dark spots of magnetic origin. We also perform the eclipse timing variation (ETV) analysis which reveals that V527 Dra has a tertiary companion whose mass (${\sim} 1 \,{\rm M}_{\odot }$) and orbital inclination (${\sim} 70^{\circ }$) are additionally constrained by radial velocities. The ETV diagram of V2846 Cyg displays a quadratic trend accompanied by a low-amplitude cyclic variation, likely due to a magnetic cycle, although further eclipse times are needed to provide a clearer explanation. Lastly, we demonstrate a correlation between the variations in spot parameters obtained via light curve modelling for individual orbital cycles and the residual ETVs, essentially confirming the assumption of magnetic activity in both systems.

Funder

Ankara University

Publisher

Oxford University Press (OUP)

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