Star-spot distributions and chromospheric activity on the RS CVn type eclipsing binary SV Cam

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Şenavcı, H. V.
Bahar, E.
Zola, S.
Hussain, G. A. J.
Frasca, A.
Işık, E.
Yörükoğlu, O.
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Oxford Univ Press
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Using a time series of high-resolution spectra and high-quality multicolour photometry, we reconstruct surface maps of the primary component of the RS CVn type rapidly rotating eclipsing binary, SV Cam (F9V + K4V). We measure a mass ratio, q, of 0.641(2) using our highest quality spectra and obtain surface brightness maps of the primary component, which exhibit predominantly high-latitude spots located between 60 and 70 latitudes with a mean filling factor of 35 per cent. This is also indicated by the R-hand light-curve inversion, subjected to rigorous numerical tests. The spectral subtraction of the H-alpha line reveals strong activity of the secondary component. The excess H-alpha absorption detected near the secondary minimum hints to the presence of cool material partially obscuring the primary star. The flux ratios of Call IRT excess emission indicate that the contribution of chromospheric plage regions associated with star-spots is dominant, even during the passage of the filament-like absorption feature.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. The authors are grateful to the anonymous referee for critical comments, which helped to improve the manuscript substantially. HVS acknowledges the support by The Scientific And Technological Research Council Of Turkey (TUBITAK) through the project 1001-115F033. DM acknowledges support by the Spanish Ministry of Economy and Competitiveness (MINECO) from project AYA2016-79425-C3-1-P. AF acknowledges Istituto Nazionale di Astrofisica (INAF) for financial support. EI acknowledges support by the Young Scientist Award Programme BAGEP-2016 of the Science Academy, Turkey.
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