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  Recurrent star-spot activity and differential rotation in KIC 11560447

Özavcı, İ., Şenavcı, H. V., Isik, E., Hussain, G. A. J., O'Neal, D., Yılmaz, M., et al. (2018). Recurrent star-spot activity and differential rotation in KIC 11560447. Monthly Notices of the Royal Astronomical Society, 474(4), 5534-5548. doi:10.1093/mnras/stx3053.

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Özavcı, İ, Author
Şenavcı, H V, Author
Isik, Emre1, Author              
Hussain, G A J, Author
O'Neal, D, Author
Yılmaz, M, Author
Selam, S O, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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Free keywords: stars: activity, binaries: close, binaries: eclipsing, stars: late-type, stars: rotation, star-spots
 MPIS_GROUPS: Sun and Heliosphere
 Abstract: We present a detailed analysis of surface inhomogeneities on the K1-type subgiant component of the rapidly rotating eclipsing binary KIC 11560447, using high-precision Kepler 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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Language(s): eng - English
 Dates: 2018-02-092018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stx3053
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 474 (4) Sequence Number: - Start / End Page: 5534 - 5548 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150