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Long-Term Starspot Activity of the Eclipsing Variable System CG Cyg

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Abstract

Photometric observations of the eclipsing variable system CG Cyg (G9+K3, P=0 d .63), which belongs to a group of short-period, chromospherically active RS CVn type stars with the same type of activity as the sun, have been made over two seasons in 2003 and 2004. The spotting of the star’s surface is modelled using the original observations together with photometric data published since 1965. In every season the spots were concentrated near the equator and covered up to 18% of the star’s entire surface, while the temperature difference between the quiescent photosphere and the spotted regions was 2100 K. Cyclical variations in the total area and average latitude of the spots, as well as flip-flop of the active longitudes, are suspected. Latitudinal drift of the spots during a cycle and differential rotation of the star are discovered. The following orbital elements are obtained: M1 = 0.93 M⊙, M2 = 0.81 M⊙, R1 = 1.01 R⊙, and R2 = 0.82 R⊙.

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Authors and Affiliations

  1. Urals State University, Russia

    A. V. Kozhevnikova, V. P. Kozhevnikov & M. A. Svechnikov

  2. Crimean Astrophysical Observatory, Ukraine

    I. Yu. Alekseev

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  1. A. V. Kozhevnikova
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  2. I. Yu. Alekseev
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  3. V. P. Kozhevnikov
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  4. M. A. Svechnikov
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__________

Translated from Astrofizika, Vol. 48, No. 3, pp. 349–363 (August 2005).

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Kozhevnikova, A.V., Alekseev, I.Y., Kozhevnikov, V.P. et al. Long-Term Starspot Activity of the Eclipsing Variable System CG Cyg. Astrophysics 48, 291–303 (2005). https://doi.org/10.1007/s10511-005-0028-1

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  • DOI: https://doi.org/10.1007/s10511-005-0028-1

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