Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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ORBITAL PERIOD VARIATION STUDY OF THE ALGOL ECLIPSING BINARY DI PEGASI

  • Hanna, M.A. (National Research Institute of Astronomy and Geophysics (NRIAG)) ;
  • Amin, S.M. (National Research Institute of Astronomy and Geophysics (NRIAG))
  • Received : 2013.05.07
  • Accepted : 2013.05.31
  • Published : 2013.08.31
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Abstract

We discuss the orbital period changes of the Algol semi-detached eclipsing binary DI Peg by constructing the (O-C) residual diagram via using all the available precise minima times. We conclude that the period variation can be explained by a sine-like variation due to the presence of a third body orbiting the binary, together with a long-term orbital period increase (dP/dt=0.17 sec/century) that can be interpreted to be due to mass transfer from the evolved secondary component (of rate $1.52{\times}10^{-8}M_{\odot}/yr$) to the primary one. The detected low-mass third body ($M_{3min.}=0.22{\pm}0.0006M_{\odot}$) is responsible for a periodic variation of about 55 years light time effect. We have determined the orbital parameters of the third component which show a considerable eccentricity $e_3=0.77{\pm}0.07$ together with a longitude of periastron ${\omega}_3=300^{\circ}{\pm}10^{\circ}$.

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References

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