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Astrophysics and Space Science

, Volume 77, Issue 2, pp 325–346 | Cite as

Two-colour photoelectric investigation of AR Lacertae

  • M. Kuturaç
  • C. Ibanoğlu
  • Z. Tunca
  • A. Y. Ertan
  • S. Evren
  • O. Tümer
Article

Abstract

The RS CVn-type eclipsing binary AR Lac has been observed in two colours,B andV, in 1978 and 1979. Several times of minima have been obtained during the observations and the new light elements have been calculated. The orbital period of the system was found to be decreasing with an amount of 14.6 s century−1.

The light curves of the system obtained inB andV show a significant wave-like distortion outside eclipses. The amplitudes of the wave-like distortion inB andV are about 0 . m 09 and 0 . m 10 in 1978, and, 0 . m 12 and 0 . m 13 in 1979, respectively. The minima of the wave-like distortion have shifted with an amount of 0 . p 40 in one year, thus indicating the migration period of the wave-like distortion is about 2.5 yr.

A noticeable variation of light during the totality of primary minimum has also been observed. This variation can be attributed to the distortion wave which has been moving towards decreasing phases.

Keywords

Colour Migration Orbital Period Light Curve Light Element 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1981

Authors and Affiliations

  • M. Kuturaç
    • 1
  • C. Ibanoğlu
    • 1
  • Z. Tunca
    • 1
  • A. Y. Ertan
    • 1
  • S. Evren
    • 1
  • O. Tümer
    • 1
  1. 1.Ege University ObservatoryIzmirTurkey

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