Chromospheric activity behavior of an eclipsing binary system KOI 68AB

Kaya N. O. , DAL H. A.

ASTRONOMISCHE NACHRICHTEN, cilt.340, ss.539-552, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 340 Konu: 6
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1002/asna.201913631
  • Sayfa Sayıları: ss.539-552


We present the results obtained from KOI 68AB's light variation, which exhibits a sinusoidal light variation due to the stellar spots. Two active regions longitudinally separated by about 180 degrees between the latitudes of +70 degrees and +110 degrees were found. A total of 313 flares were determined, and flare parameters were calculated. The One Phase Exponential Association model was derived using these parameters. The energy saturation parameter Plateau value was found to be 1.219 +/- 0.088 s, and its time scale parameter half-life value was found to be 1,190 s. The flare number per hour, known as N-1 frequency, was found to be 0.02406 h(-1), while the flare-equivalent duration emitted per hour, known as N-2, was found to be 0.000008. Considering new spectral observations, the target seems to be an eclipsing binary system. Because of this, the light curve is analyzed under an assumption that the target is an eclipsing binary. In these analyses, the sum of the fractional radii is found to be 0.1908, and the fractional radii ratio is 1.8973.