Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution

  title={Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution},
  author={Yuksel Karatas and Selçuk Bilir and Zeki Eker and Osman Mirza Demircan},
  journal={Monthly Notices of the Royal Astronomical Society},
The kinematics of 237 chromospherically active binaries (CABs) were studied. The sample is heterogeneous with different orbits and physically different components from F to M spectral-type main-sequence stars to G and K giants and supergiants. The computed U, V, W space velocities indicate that the sample is also heterogeneous in velocity space. That is, both kinematically younger and older systems exist among the non-evolved main sequence and the evolved binaries containing giants and… 

Kinematics of W Ursae Majoris type binaries and evidence of the two types of formation

We study the kinematics of 129 W UMa binaries and we discuss its implications on the contact binary evolution. The sample is found to be heterogeneous in the velocity space. That is, kinematically

Mass loss and orbital period decrease in detached chromospherically active binaries

The secular evolution of the orbital angular momentum (OAM), the systemic mass (M = M1+M2) and the orbital period of 114 chromospherically active binaries (CABs) were investigated after determining

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Secular period decreasing of detached chromospherically active binaries

AbstractThe long-term orbital period changes of a large sample of detached chromospherically active binaries (CABs) were studied. Eleven such systems were found to be undergoing secular period

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Traditionally, runaway stars are O- and B-type stars with large peculiar velocities. We would like to extend this definition to young stars (up to ≈50 Myr) of any spectral type and to identify those

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The RS CVn Binaries and Binaries with Similar Properties

  • D. Hall
  • Computer Science, Physics
  • 1976
This paper will review reasonably thoroughly and comprehensively the many observational properties of the remarkable RS CVn-type binaries and show that many of these same properties are observed in other types of binary systems.

Galaxies & the universe.

! = 13"10 9 " 365 " 24 " 3600 s . Hubble’s law says that expansion speed is proportional to distance, ! = Hr so that c = HR , and therefore the Hubble constant is H = 1 / ! . Thus the acceleration of