Starspot activity of the red dwarf star V772 Her

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

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.

Full Text

Restricted Access

About the authors

I. Yu. Alekseev

Crimean Astrophysical Observatory of RAS

Author for correspondence.
Email: ilya-alekseev@mail.ru
Russian Federation, Crimea, Nauchny

A. V. Kozhevnikova

B.N. Yeltsin Ural Federal University

Email: ilya-alekseev@mail.ru
Russian Federation, Yekaterinburg

V. P. Kozhevnikov

B.N. Yeltsin Ural Federal University

Email: ilya-alekseev@mail.ru
Russian Federation, Yekaterinburg

References

  1. A.H. Butten, C.L. Morbey, F.C. Fekel, J. Tomkin, Publ. Astron. Soc. Pacif. 91, 304 (1979).
  2. C.D. Scarfe, Inform. Bull. Var. Stars. 1357 (1977).
  3. V. Reglero, M.J. Fernándes-Figueroa, A. Giménes, et al., Astron. and Astrophys. Suppl. Ser. 88, 545 (1991).
  4. F.C. Fekel, Astrophys. J. 246, 879 (1981).
  5. S.A. Drake, T. Simon, J.L. Linsky, Astrophys. J. 91, 1229 (1986).
  6. M. Landini, C.M.F. Brunella, F. Paresce, R.A. Stern, Astrophys. J. 289, 709 (1985).
  7. K.G. Strassmeier, D.S. Hall, L.J. Boyd, and R.M. Genet, Astrophys. J. Suppl. Ser. 69, 141 (1989).
  8. J.R. Bruton, D.S. Hall, L.J. Boyd, et al., Astrophys. Space Sci. 155, 27 (1989).
  9. G.A. Bakos and J. Tremko, Co. Ska. 12, 65 (1984).
  10. G.A. Bakos and J. Tremko, Astrophys. Space Sci. Lib. 98, 67 (1982).
  11. L.J. Boyd, R.M. Genet, D.S. Hall, and W.T. Persinger, Inform. Bull. Var. Stars. 2747 (1985).
  12. V. Piirola, Observ. Astrophys. Lab. Univ. Helsinki. Rep. 6, 151 (1984).
  13. V.P. Kozhevnikov, P.E. Zakharova, Astron. Soc. Pacif. Conf. Ser. 219, 381 (2000).
  14. R.F. Stern and A. Skumanich, Astrophys. J. 267, 232 (1983).
  15. И.Ю. Алексеев, Изв. Крымск. астрофиз. обсерв. 104, 272 (2008).
  16. И.Ю. Алексеев, Астрофизика 57, 275 (2014).
  17. А.В. Кожевникова, И.Ю. Алексеев, Астрон. журн. 92, 818 (2015).
  18. И.Ю. Алексеев, А.В. Кожевникова, Астрон. журн. 94, 240 (2017).
  19. И.Ю. Алексеев, А.В. Кожевникова, Астрон. журн. 95, 421 (2018).
  20. А.В. Кожевникова, И.Ю. Алексеев, В.П. Кожевников, Астрон. журн. 100, 811 (2023).
  21. I.Yu. Alekseev, Solar Phys. 224, 187 (2004).
  22. И.Ю. Алексеев, А.В. Кожевникова, Изв. Крым. Астрофиз. Обсерв. 118 (3), 27 (2022).

Supplementary files

Supplementary Files
Action
1. JATS XML
Download
2. Fig. 1. Light curves and color indices of V772 Her. a: 2012, UrFU. b: 2012, KrAO. c: 2014, KrAO. d: 2016, KrAO.

Download (649KB)
Indexing metadata
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.

Download (327KB)
Indexing metadata
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.

Download (222KB)
Indexing metadata
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).

Download (146KB)
Indexing metadata

Copyright (c) 2024 The Russian Academy of Sciences