Variations in the orbital periods of eclipsing binaries δ Lib and SX Lyn

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Abstract

Variations in the orbital period of eclipsing binaries δ Lib and SX Lyn are studied. It is shown that these variations can be represented with equal accuracy in two ways: either in the form of a superposition of secular decrease and cyclic variations or only in the form of cyclic fluctuations. Cyclic variations in the period of δ Lib in both cases can be due to the presence of a third body in the system. In the case of a quadratic representation, they can be also a consequence of the magnetic activity of the secondary component. For SX Lyn a superposition of two cyclic variations is found for both linear and quadratic representation. The lower-period variations in both cases can be due to the presence of a third body in the system. The longer-period variation can be a consequence of the magnetic activity of the secondary component. The secular decrease in the periods of both systems could be due to a loss of angular momentum due to magnetic braking.

About the authors

A. I. Khaliullina

Sternberg State Astronomical Institute, Lomonosov Moscow State University

Author for correspondence.
Email: hfh@sai.msu.ru
Russian Federation, Moscow

References

  1. J. F. J. Schmidt, Astron. Nachr. 63, 39 (1865).
  2. J. Stebbins, Publ. Wahsburns Obs., 15, 33 (1928).
  3. R. H. Koch, Astron. J. 67, 130 (1962).
  4. C. Lazaro, M. J. Arevalo, and A. Claret, Monthly Not. Roy. Astron. Soc. 334, 542 (2002).
  5. V. Bakis, E. Budding, A. Erdem, H. Bakis, O. Demircan, and P. Hadrava, Monthly Not. Roy. Astron. Soc. 370, 1935 (2006).
  6. J. Tomkin, Astrophys. J. 221, 608 (1978).
  7. A. Dervisoglu, K. Pavlovski, H. Lehmann, J. Southworth, and D. Bewsher, Monthly Not. Roy. Astron. Soc. 481, 5660 (2018).
  8. T. F. Worek, Publ. Astron. Soc. Pacif. 113, 964 (2001).
  9. E. Geyer, R. Kippenhahn, and W. Strohmeier, Kleine Veröffentlichungen der Remeis – Sternwarte Bamberg № 9, (1955).
  10. B. Wedel and W. Wenzel, Mitt. Veränder. Sterne 1, № 206 (1955).
  11. W. Götz and W. Wenzel, Mitt. Veränder. Sterne 1, № 570, (1961).
  12. D. MacDonald, McCormick Publ. 12, part 5, 51 (1964).
  13. M. A. Svechnikov and Eh. F. Kuznetsova, Vizier On-line Data Catalog: Approximate elements of eclipsing binaries (1990).
  14. B. R. N. O. Project–Eclipsing Binaries database, http://var2.astro.cz/EN/brno/index.php.
  15. Д. Я. Мартынов Переменные звезды (в кн. М. С. Зверев, Б. В. Кукаркин, Д. Я. Мартынов, П. П. Паренаго, Н. Ф. Флоря и В. П. Цесевич, т. 3, Гостехиздат, 464–490, 1947).
  16. А. И. Халиуллина и Х. Ф. Халиуллин, Астрон. журн. 61, 393 (1984).
  17. Z. Eker, F. Soudugan, E. Soydugan, S. Bilir, E. Yaz Gökçe, I. Steer, M. Tüysüz, T. Şenyüz, and O. Demircan, Astron. J. 149, 131 (2015).
  18. Х. Ф. Халиуллин, Астрон. журн. 51, 395 (1974).
  19. N. Ivanova and R. E. Taam, Astrophys. J. 599, 516 (2003).
  20. N. Nanouris, A. Kalimeris, E. Antonopolou, and H. Rjvithis-Livaniou, Astron. and Astrophys. 535, 126 (2011).
  21. J. H. Applegate, Astrophys. J. 385, 621 (1992).
  22. A. F. Lanza, M. Rodono, and R. Rosner, Monthly Not. Roy. Astron. Soc. 296, 893 (1998).
  23. A. F. Lanza and M. Rodono, Astron. and Astrophys. 349, 887 (1999).
  24. А. И. Халиуллина, Астрон. журн. 93, 795 (2016).
  25. А. И. Халиуллина, Астрон. журн. 94, 849 (2017).
  26. А. И. Халиуллина, Астрон. журн. 98, 149 (2021).
  27. А. И. Халиуллина, Астрон. журн. 98, 550 (2021).

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