Recurrent star-spot activity and differential rotation in KIC 11560447
| العنوان: | Recurrent star-spot activity and differential rotation in KIC 11560447 |
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| المؤلفون: | Emre Işık, Douglas O'Neal, M. Yılmaz, Gaitee A. J. Hussain, I. Özavcı, Hakan Volkan Şenavci, Selim O. Selam |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 474:5534-5548 |
| بيانات النشر: | Oxford University Press (OUP), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics, 010308 nuclear & particles physics, Starspot, Phase (waves), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Light curve, 01 natural sciences, Spectral line, law.invention, Telescope, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, law, Observatory, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Differential rotation, Astrophysics::Earth and Planetary Astrophysics, Longitude, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR) |
| الوصف: | We present a detailed analysis of surface inhomogeneities on the K1-type sub-giant component of the rapidly rotating eclipsing binary KIC 11560447, using high-precision Kepler light curves spanning nearly four years, corresponding to about 2800 orbital revolutions. We precisely determine the system parameters 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 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 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 to 1.3-year recurrence period in starspot emergence, accompanied by a secular increase in the axisymmetric component of spot occupancy. Accepted by MNRAS |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stx3053 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c269a3defb918a624912e032a921159 https://doi.org/10.1093/mnras/stx3053 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....8c269a3defb918a624912e032a921159 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/stx3053 |