Comprehensive analysis of the eclipsing binaries V527 Dra and V2846 Cyg


Čeki A., ŞENAVCI H. V., Latković O., Uzunçam E., YORULMAZ E. B., BAHAR E.

Monthly Notices of the Royal Astronomical Society, cilt.532, sa.3, ss.3582-3603, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 532 Sayı: 3
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1093/mnras/stae1709
  • Dergi Adı: Monthly Notices of the Royal Astronomical Society
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.3582-3603
  • Anahtar Kelimeler: binaries: close, binaries: eclipsing, stars: fundamental parameters, stars: individual: V2846 Cyg, stars: individual: V527 Dra
  • Ankara Üniversitesi Adresli: Evet

Özet

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 (∼1 M ⊙) and orbital inclination ( ∼70 °) 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.