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Spots and Active Regions on Emission Stars. III. LQ Hya

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Abstract

Quasisimultaneous photoelectric, polarimetric, and spectroscopic observations of the active single red dwarf LQ Hya are presented. The photometric variability of LQ Hya is fully described by a zone model. Spotted regions occupy up to 25% of the entire surface of the star with a temperature difference of 800 K between the spots and the calm photosphere. The spots are localized in the middle and low latitudes. A cyclical variation is observed in the total areas of the spotted regions and in the average latitude of the spots. The most spotted regions, local magnetic fields, and chromospherically active regions tend to concentrate in the same distinct active longitudes.

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REFERENCES

  1. I. Yu. Alekseev, Astron. Zh. 77, 207 (2000).

    Google Scholar 

  2. I. Yu. Alekseev and O. V. Kozlova, Astrofizika 43, 339 (2000).

    Google Scholar 

  3. I. Yu. Alekseev and O. V. Kozlova, Astrofizika 44, 529 (2001).

    Google Scholar 

  4. F. C. Fekel, B. W. Bopp, J. L. Africano, B. D. Goodrich et al., Astron. J. 92, 1150 (1986).

    Google Scholar 

  5. R.D. Jeffries, Mon. Notic. Roy. Astron. Soc. 273, 559, (1995).

    Google Scholar 

  6. O. J. Eggen, Astron. J. 89, 1358 (1986).

    Google Scholar 

  7. K. G. Strassmeier and D. S. Hall, Astrophys. J. Suppl. Ser. 67, 453 (1988).

    Google Scholar 

  8. L. J. Boyd, R.M. Genet, D. S. Hall et al., IAPPPC 42, 44 (1990).

    Google Scholar 

  9. L. Jetsu, Astron. Astrophys. 276, 345 (1993).

    Google Scholar 

  10. G. Cutispoto, Astron. Astrophys. Suppl. Ser. 89, 435 (1991).

    Google Scholar 

  11. G. Cutispoto, Astron. Astrophys. Suppl. Ser. 102, 655 (1993).

    Google Scholar 

  12. G. Cutispoto, Astron. Astrophys. Suppl. Ser. 119, 281 (1996).

    Google Scholar 

  13. G. Cutispoto, Astron. Astrophys. Suppl. Ser. 127, 207 (1998).

    Google Scholar 

  14. G. Cutispoto, Astron. Astrophys. Suppl. Ser. 131, 321 (1998).

    Google Scholar 

  15. G. Cutispoto, M. Rodony, and S. Messina, Astron. Astrophys. 367, 910 (2001).

    Google Scholar 

  16. K. G. Strassmeier, J.B. Rice, W.H. Wehlau et al., Astron. Astrophys. 268, 671 (1993).

    Google Scholar 

  17. K. G. Strassmeier, J. Bartus, G. Cutispoto, and M. Rodony, Astron. Astrophys. Suppl. Ser. 125, 11 (1997).

    Google Scholar 

  18. K. G. Strassmeier, E. Serkowitsch, and Th. Granzer, Astron. Astrophys. Suppl. Ser. 140, 29 (1999).

    Google Scholar 

  19. S. V. Berdyugina, J. Pelt, and I. Tuominen, Astron. Astrophys. 394, 505 (2002).

    Google Scholar 

  20. K. Olбh, Z. Kollбth, and K. G. Strassmeier, Astron. Astrophys. 356, 643 (2000).

    Google Scholar 

  21. I. Yu. Alekseev and R. E. Gershberg, Astrofizika 39, 67 (1996).

    Google Scholar 

  22. I. Yu. Alekseev and O.V. Kozlova, Astron. Astrophys., accepted, 2002.

  23. J. B. Rice and K. G. Strassmeier, Astron. Astrophys. 336, 972 (1998).

    Google Scholar 

  24. J.-F. Donati, Mon. Notic. Roy. Astron. Soc. 302, 457 (1999).

    Google Scholar 

  25. S. H. Saar, N. E. Piskunov, and I. Tuominen, Cool Stars, Stellar Systems and the Sun, M.S. Giampapa and J.A. Bookbinder, eds., Astron. Soc. Pacif. Conf. Ser. 26, 255 (1992).

  26. S. H. Saar, N. E. Piskunov, and I. Tuominen, Cool Stars, Stellar Systems and the Sun, J.P. Caillault, ed., Astron. Soc. Pacif. Conf. Ser. 64, 661 (1994).

  27. S. V. Berdyugina, I. V. Ilyin, and I. Tuominen, Cool Stars, Stellar Systems and the Sun, R.J. Garcia Lypez, R. Rebolo, and M. R. Zapatero Osorio, eds., Astron. Soc. Pacif. Conf. Ser. 223, 1207 (2001).

  28. F. C. Fekel, T. J. Moffett, and G. W. Henry, Astrophys. J. Suppl. Ser. 60, 551 (1986).

    Google Scholar 

  29. O. Vilhu, B. Gustafsson, and F.M. Walter, Astron. Astrophys. 241, 167 (1991).

    Google Scholar 

  30. V. Piirola, Observ. Astrophys. Lab. Univ. Helsinki. Rep. 6, 151 (1984).

    Google Scholar 

  31. Ju. Huovelin, S. H. Saar, and I. Tuominen, Astrophys. J. 329, 882 (1988).

    Google Scholar 

  32. Ju. Huovelin and S. H. Saar, Astrophys. J. 374, 319 (1991).

    Google Scholar 

  33. S. H. Saar and Ju. Huovelin, Astrophys. J. 404, 739 (1993).

    Google Scholar 

  34. S. H. Saar, in: Stellar Surface Structure, K. G. Strassmeier and J. L. Linsky, eds., Kluwer, Dordrecht (1996), p. 237.

    Google Scholar 

  35. N. E. Piskunov, in: Stellar Magnetism [in Russian], Yu. V. Glagoleveskii and I. I. Romanyuk, eds., Nauka, St. Petersburg (1992), p. 92.

    Google Scholar 

  36. N. E. Piskunov, F. Kupka, T. A. Ryabchikova et al., Astron. Astrophys. Suppl. Ser. 112, 525 (1995).

    Google Scholar 

  37. N. E. Piskunov, F. Kupka, T.A. Ryabchikova et al., Astron. Astrophys. Suppl. Ser. 138, 119 (1999).

    Google Scholar 

  38. L. E. Cram and D.J. Mullan, Astrophys. J. 234, 579 (1979).

    Google Scholar 

  39. M. S. Giampapa and J. Liebert, Astrophys. J. 305, 784 (1986).

    Google Scholar 

  40. J. H. M. M. Bruls, M. SchЬssler, and S. M. Solanki, Solar and Stellar Activity: Similarities and Differences, C.J. Butler and J. G. Doyle, eds., Astron. Soc. Pacif. Conf. Ser. 158, 182 (1999).

  41. J. A. Eaton, G. W. Henry, and F. C. Fekel, Astrophys. J. 462, 888 (1996).

    Google Scholar 

  42. I. Yu. Alekseev and R. E. Gershberg, Astron. Zh. 73, 579 (1996).

    Google Scholar 

  43. I. Yu. Alekseev and R. E. Gershberg, Astron. Zh. 74, 240 (1997).

    Google Scholar 

  44. I. Yu. Alekseev, Low-mass Spotted Stars [in Russian], Astroprint, Odessa (2001).

    Google Scholar 

  45. I. Yu. Alekseev, Astron. Zh., in press (2002).

  46. Y. C. Unruh, R. Knaak, M. Fligge, and S. K. Solanki, in: Cool Stars, Stellar Systems and the Sun, R. J. Garcia Lypez, R. Rebolo, and M. R. Zapatero Osorio, eds., Astron. Soc. Pacif. Conf. Ser. 223, 748 (2001).

  47. W. Van Hamme, Astron. J. 106, 2096 (1993).

    Google Scholar 

  48. J. D. Dorren, Astrophys. J. 320, 756 (1987).

    Google Scholar 

  49. S. H. Saar and J.E. Neff, Cool Stars, Stellar Systems and the Sun, G. Wallerstein, ed., Astron. Soc. Pacif. Conf. Ser. 9, 171 (1990).

  50. Y. C. Unruh, in: Stellar Surface Structure, K.G. Strassmeier and J. L. Linsky, eds., Kluwer, Dordrecht (1996), p.35.

    Google Scholar 

  51. M. SchЬssler, P. Caligari, A. Ferriz-Mas et al., Astron. Astrophys. 314, 503 (1996).

    Google Scholar 

  52. Th. Granzer, M. SchЬssler, P. Caligari, and K. G. Strassmeier, Astron. Astrophys. 335, 1087 (2000).

    Google Scholar 

  53. L. L. Kitchatinov, M. Jardine, and J.-F. Donati, Mon. Notic. Roy. Astron. Soc. 318, 1171 (2000).

    Google Scholar 

  54. G. Basri and G. W. Marcy, Astrophys. J. 431, 844 (1994).

    Google Scholar 

  55. J. E. Vernazza, E. H. Avrett, and R. Loeser, Astrophys. J. Suppl. Ser. 45, 635 (1981).

    Google Scholar 

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  1. Crimean Astrophysical Observatory, Ukraine

    I. Yu. Alekseev & O. V. Kozlova

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  1. I. Yu. Alekseev
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Alekseev, I.Y., Kozlova, O.V. Spots and Active Regions on Emission Stars. III. LQ Hya. Astrophysics 46, 28–45 (2003). https://doi.org/10.1023/A:1022959419060

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