Origin of the orbital period change in contact binary stars

V. V. Sargsyan, H. Lenske, G. G. Adamian, N. V. Antonenko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The evolution of contact binary star systems in mass asymmetry (transfer) coordinate is considered. The orbital period changes are explained by an evolution in mass asymmetry towards the symmetry (symmetrization of binary system). It is predicted that decreasing and increasing orbital periods are related, respectively, with the nonoverlapping and overlapping stage of the binary star during its symmetrization. A huge amount of energy U ≈ 1041J is converted from the potential energy into internal energy of the stars during the symmetrization. As shown, the merger of stars in the binary systems, including KIC 9832227, is energetically an unfavorable process. The sensitivity of the calculated results to the values of total mass and orbital angular momentum is analyzed.

Original languageEnglish
Article number1950044
JournalInternational Journal of Modern Physics E
Issue number6
Publication statusPublished - 1 Jun 2019


  • Close binary stars
  • mass asymmetry
  • mass transfer

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy(all)

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