Dynamical Evolution of the RS CVn-type Binaries

Demircan O.

Turkish Journal of Physics, vol.23, no.2, pp.425-432, 1999 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 2
  • Publication Date: 1999
  • Journal Name: Turkish Journal of Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.425-432
  • Ankara University Affiliated: Yes

Abstract

The orbital angular momentum (orbital AM) of a sample of forty RS CVn-type binaries with the orbital periods P≤10 days were estimated and the orbital AM distribution with respect to P was critically interpreted as the orbital AM evolution of these systems caused by the magnetic breaking process with the existence of spin-orbit coupling. The empirical relations (between the orbital AM loss, mass loss and period variation) derived from the diagram of the orbital AM distribution were used in deriving a semi-empirical formula for the dynamical evolution of the RS CVn-type binaries. The magnetic breaking induced dynamical evolution of the RS CVn-type binaries maybe at different rates but is always towards the shorter periods in the existence of spin-orbit coupling and before the Roche lobe filling of a component star.