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The Korean Astronomical Society (한국천문학회)
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PERIOD VARIATION OF EROS ECLIPSING BINARY SYSTEMS IN THE LARGE MAGELLAN CLOUD

  • RITTIPRUK, P. (Department of Astronomy and Space Science, Sejong University) ;
  • HONG, K.S. (Korea Astronomy and Space Science Institute) ;
  • KANG, Y.W. (Department of Astronomy and Space Science, Sejong University)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
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Abstract

We investigated the period variation for 79 eclipsing binary systems using 20 years (1990-2009) of EROS, Macho, and OGLE survey observations. We discovered 9 apsidal motions, 8 mass transfers, 5 period increasing and decreasing systems, 12 light-travel-time effects, 5 eccentric systems and 40 other systems showing no period variations. We select 3 representative eclipsing binary systems; EROS 1052 for apsidal motion, EROS 1056 for mass transfer, and EROS 1037 for the light-travel-time effect. We determine the period variation rate (dP/dt), orbital parameters of the 3rd body (e3, ${\omega}_3$, $f(m_3)$, $P_3$, $T_3$), apsidal motion parameters ($d{\omega}/dt$, U, Ps, Pa, e) and apsidal motion period by analyzing the light curves and O-C diagrams.

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References

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