Starspot activity of the red dwarf star V772 Her

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Resumo

The photometric behavior of the spotted primary component of the eclipsing dwarf system V772 Her (G0V + M5V) is considered based on long-term multicolor photoelectric observations. The total photometric effect caused by starspots reaches up to 0.m19. Our simulations showed that the area of the spotted regions can reach up to 13% of the total surface of the star. The spots are 1800 K cooler than the unspotted photosphere and are located at low latitudes.

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Sobre autores

I. Alekseev

Crimean Astrophysical Observatory of RAS

Autor responsável pela correspondência
Email: ilya-alekseev@mail.ru
Rússia, Crimea, Nauchny

A. Kozhevnikova

B.N. Yeltsin Ural Federal University

Email: ilya-alekseev@mail.ru
Rússia, Yekaterinburg

V. Kozhevnikov

B.N. Yeltsin Ural Federal University

Email: ilya-alekseev@mail.ru
Rússia, Yekaterinburg

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2. Fig. 1. Light curves and color indices of V772 Her. a: 2012, UrFU. b: 2012, KrAO. c: 2014, KrAO. d: 2016, KrAO.

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3. Fig. 2. Light curves of V772 Her according to KWS data. The dots with bars are the average nightly brightness values ​​in the V band, the red lines are the approximation of the seasonal light curves by the first two Fourier harmonics.

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4. Fig. 3. Two-color diagrams: UrFU — green circles, KrAO 2012 — red, KrAO 2014 — dark red, KrAO 2016 — pink. Blue stars — the position of the star in its brightest state of brightness.

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5. Fig. 4. Summary light curve of V772 Her in the V filter (black vertical lines — literature data, green — UrFU, red — KrAO, blue — KWS); time course of the total area and average latitude of spots; changes in the position of active longitudes (black circles — main, open — secondary).

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