SpringerLink
Log in

Spots and active regions on the emission-line, red dwarf star v 775 her

  • Published:
Astrophysics Aims and scope

Abstract

Quasi-simultaneous photoelectric and spectroscopic observations of the active spotted star V 775 Her have been made for the first time and showed an increase in the equivalent width of the pure emission in the Ha line with a decrease in the star’s brightness. Such an increase was due to an increase in electron density in the active regions and demonstrates a connection between active regions and cool spots. The system’s photometric variability is fully described within the framework of a zonal model. The spotted regions occupy up to 42% of the star’s total surface if the temperature difference between the quiet photosphere and a spot is about 900 K. The ratio of the masses of the components of V 775 Her is estimated for the first time.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price includes VAT (Germany)

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. I. Yu. Alekseev,Astron. Zh. (2000) (in press).

  2. M. Imbert,Astmn. Astrophys. Suppl. Ser.,38. 401 (1979).

    ADS  Google Scholar 

  3. A. H. Joy and R. E. Wilson,Astrophys. J.,109, 232 (1949).

    Article  ADS  Google Scholar 

  4. B. W. Bopp, P. V. Noah, A. N. Klimke, and J. L. Africano,Astrophys. J.,249, 210 (1981).

    Article  ADS  Google Scholar 

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

    Article  ADS  Google Scholar 

  6. K. G. Strassmeier, F. C. Fekel, B. W. Bopp, et al.,Astrophys. J. Suppl. Ser.,72, 191 (1990).

    Article  ADS  Google Scholar 

  7. Xue-Fu Liu and Hui-Song Tan ,Inf. Bull. Var. Stars, No. 2606 (1984).

  8. Xue-Fu Liu and Hui-Song Tan,Bull. Am. Astron. Soc.,17, 588 (1985).

    ADS  Google Scholar 

  9. Xue-Fu Liu and Hui-Song Tan,Chin. Astron. Astrophys.,10, 221 (1986).

    Article  ADS  Google Scholar 

  10. G. W. Henry ,Inf. Bull. Var. Stars, No. 1927 (1981).

  11. B. W. Bopp, J. L. Africano, R. E. Stencel, et al.,Astrophys. J.,275, 691 (1983).

    Article  ADS  Google Scholar 

  12. M. S. Akan,Astrophys. Space Sci.,169, 159 (1990).

    Article  ADS  Google Scholar 

  13. J. Kaluzny ,Inf. Bull. Var. Stars, No. 2627 (1984).

  14. M. Rodonó and G. Cutispoto,Astron. Astrophys. Suppl. Ser.,95, 55 (1992).

    ADS  Google Scholar 

  15. V. Piirola,Obs. Astwphys. Lab. Univ. Helsinki,6, 151 (1984).

    Google Scholar 

  16. V. Piirola , in:Polarized Radiation of Circumstellar Origin, G. V. Coyne, A. M. Magalhaes, A. F. J. Moffat, et al., eds., Vatican Observatory (1988), p. 735.

  17. S. Yu. Kalmin.Kinemat. Fiz. Nebesn. Tel,11, No. 3, 82 (1995).

    Google Scholar 

  18. S. Yu. Kalmin and D. N. Shakhovskoi,Kinemat. Fiz. Nebesn. Tel,11, No. 3, 85 (1995).

    Google Scholar 

  19. I. Yu. Alekseev and N. I. Shakhovskaya,Izv. Krym. Astrofiz. Obs.,89, 93 (1995).

    ADS  Google Scholar 

  20. I. Yu. Alekseev,Astron. Zh.,73, 86 (1996).

    Google Scholar 

  21. I. Yu. Alekseev and N. I. Bondar’,Astron. Zh.,75, 742 (1998).

    Google Scholar 

  22. I. Yu. Alekseev , in:Proceedings of the Fourth Session of the EAAO, Moscow (1998), p. 110.

  23. I. Yu. Alekseev,Izv. Krym. Astrofiz. Obs.,95. 83 (1999).

    Google Scholar 

  24. H. L. Johnson,Ann. Rev. Astron. Astrophys.,4, 193 (1966).

    Article  ADS  Google Scholar 

  25. N. E. Piskunov, in:Magnetism of Stars [in Russian], Yu. V. Glagolevskii and I.I. Romanyuk, eds., Nauka, St. Petersburg (1992). p. 92.

    Google Scholar 

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

    ADS  Google Scholar 

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

    Article  ADS  Google Scholar 

  28. Z. Eker, D. S. Hall, and C. M. Anderson,Astrophys. J. Suppl. Ser.,96, 581 (1995).

    Article  ADS  Google Scholar 

  29. D. Montes, M. J. Fernandes-Figueroa, E. De Castro, and J. Sanz-Forcada,Astron. Astrophys. Suppl. Ser.,125, 263 (1997).

    Article  ADS  Google Scholar 

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

    Article  ADS  Google Scholar 

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

    Google Scholar 

  32. I. Yu. Alekseev and R. E. Gershberg,Astron. Zh.,73, 589 (1996).

    Google Scholar 

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

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Crimean Astrophysical Observatory, Ukraine

    I. Y. Alekseev & O. V. Kozlova

Authors
  1. I. Y. Alekseev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. O. V. Kozlova
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Translated from Astrofizika, Vol. 43, No. 3, pp. 339-351, July–September, 2000.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Alekseev, I.Y., Kozlova, O.V. Spots and active regions on the emission-line, red dwarf star v 775 her. Astrophysics 43, 245–255 (2000). https://doi.org/10.1007/BF02683957

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02683957

Keywords

Search

Navigation