Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 474, Issue 4, Pages 5534-5548Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3053
Keywords
stars: activity; binaries: close; binaries: eclipsing; stars: late-type; stars: rotation; star-spots
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Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [1001 - 115F033]
- Young Scientist Award Programme BAGEP of the Science Academy, Turkey
- IDEX initiative at Universite Federale Toulouse Midi-Pyrenees (UFTMiP)
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We present a detailed analysis of surface inhomogeneities on the K1-type subgiant component of the rapidly rotating eclipsing binary KIC 11560447, using high-precisionKepler light curves spanning nearly 4 yr, which corresponds to about 2800 orbital revolutions. We determine the system parameters precisely, using high-resolution spectra from the 2.1-m Otto Struve Telescope at the McDonald Observatory. We apply the maximum entropy method to reconstruct the relative longitudinal spot occupancy. Our numerical tests show that the procedure can recover large-scale random distributions of individually unresolved spots, and it can track the phase migration of up to three major spot clusters. By determining the drift rates of various spotted regions in orbital longitude, we suggest a way to constrain surface differential rotation and we show that the results are consistent with periodograms. The K1IV star exhibits two mildly preferred longitudes of emergence, indications of solar-like differential rotation, and a 0.5-1.3-yr recurrence period in star-spot emergence, accompanied by a secular increase in the axisymmetric component of spot occupancy.
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