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Starspot activity and differential rotation in KIC 11560447

Published online by Cambridge University Press:  27 November 2018

Emre Işık Open the ORCID record for Emre Işık [Opens in a new window] ,
İbrahim Özavcı ,
Hakan V. Şenavcı ,
Gaitee A. J. Hussain ,
Douglas O’Neal ,
Mesut Yılmaz  and
Selim O. Selam
Emre Işık
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077, Göttingen, Germany email: [email protected] Feza Gürsey Center for Physics and Mathematics, Boğaziçi University, 34684 Istanbul, Turkey
İbrahim Özavcı
Affiliation:
Dept. of Astronomy and Space Sciences, Ankara University, Tandoğan 06100 Ankara, Turkey
Hakan V. Şenavcı
Affiliation:
Dept. of Astronomy and Space Sciences, Ankara University, Tandoğan 06100 Ankara, Turkey
Gaitee A. J. Hussain
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany Université de Toulouse, UPS-OMP, IRAP, 14 Avenue E. Belin, Toulouse, 31400, France
Douglas O’Neal
Affiliation:
Keystone College, School of Arts and Sciences, La Plume, PA, 18440, USA
Mesut Yılmaz
Affiliation:
Dept. of Astronomy and Space Sciences, Ankara University, Tandoğan 06100 Ankara, Turkey
Selim O. Selam
Affiliation:
Dept. of Astronomy and Space Sciences, Ankara University, Tandoğan 06100 Ankara, Turkey
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Abstract

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Using high-precision photometry from the Kepler mission, we investigate patterns of spot activity on the K1-type subgiant component of KIC 11560447, a short-period late-type eclipsing binary. We tested the validity of maximum entropy reconstructions of starspots by numerical simulations. Our procedure successfully captures up to three large spot clusters migrating in longitude. We suggest a way to measure a lower limit for stellar differential rotation, using slopes of spot patterns in the reconstructed time-longitude diagram. We find solar-like differential rotation and recurrent spot activity with a long-term trend towards a dominant axisymmetric spot distribution during the period of observations.

Keywords

stars: activity(stars:) binaries: eclipsingstars: late-typestars: spots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S340: Long-term Datasets for the Understanding of Solar and Stellar Magnetic Cycles , February 2018 , pp. 235 - 236
Copyright
Copyright © International Astronomical Union 2018 

References

Collier Cameron, A., 1997, MNRAS, 287, 556Google Scholar
Reinhold, T. & Arlt, R., 2015, A&A, 576, A15Google Scholar
Özavcı, I., Şenavcı, H. V., Işık, E., et al. 2018, MNRAS, 474, 5534Google Scholar