Astrophysics and Space Science

, Volume 95, Issue 2, pp 235–253 | Cite as

Characteristics of activity energetics of the UV cet-type flare stars

  • R. E. Gershberg
  • N. I. Shakhovskaya


A quantitative comparison of energetics of different manifestations of the activity of the UV Cet-type flare stars — sporadic flares, quiet chromospheres and coronae and stellar spots — have been carried out. On the basis of a statistical analysis of about 1800 flares registered for 23 flare stars, the energy spectra of flares have been constructed and time-averaged powers of optical radiation of flares —Lflares — have been estimated. By use of spectroscopic observations of 26 flare stars between flares, the total radiation in Balmer lines of quiet chromospheres —LBal — have been found. On the basis of these data and the soft X-ray observations of 29 flare stars, the mean of the ratiosLflares/Lbol,LBal/Lbol andL X /Lbol have been found to be equal to (1–2)×10−4. By use of photometric observations for 9 stars, the total starspot radiation deficits —Lspots — have been estimated as (4×10−3−6×10−2Lbol. Discussions of probable underestimates in the valuesLflares,LBal,L X , andLspots leads to the conclusion that the total power of non-equilibrium processes that take place in flare star atmospheres is close to the total starspot radiation deficit in these stars.


Flare Energy Spectrum Total Power Quantitative Comparison Optical Radiation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Agrawal, P. S., Rao, A. R., and Sreekantan, B. V.: 1983, in P. Byrne and M. Rodonó (eds.),Activity in Red Dwarf Stars, D. Reidel Publ. Co., Dordrecht, Holland, p. 125.Google Scholar
  2. Chugainov, P. F.: 1972,Izv. Crimean Astrophys. Obs. 46, 14.Google Scholar
  3. Cristaldi, S. and Rodonó, M.: 1975, in V. Sherwood and L. Plaut (eds.), ‘Variable Stars and Stellar Evolution’,IAU Symp,67, 75.Google Scholar
  4. Gershberg, R. E.: 1972,Astrophys. Space Sci. 19, 75.Google Scholar
  5. Gershberg, R. E.: 1975, in V. Sherwood and L. Plaut (eds.), ‘Variable Stars and Stellar Evolution’,IAU Symp. 67, 47.Google Scholar
  6. Gliese, W.: 1969,Veröff. Astron. Rechen-Institut, No. 22, Heidelberg.Google Scholar
  7. Grinin, V. P. and Katysheva, N. A.: 1980,Izv. Crimean Astrophys. Obs. 62, 66.Google Scholar
  8. Haisch, B. M., Linsky, J. L., Harnden, F. R., Rosner, R., Seward, F. D., and Vaiana, G. S.: 1980,Astrophys. J. 242, L99.Google Scholar
  9. Haisch, B. M., Linsky, J. L., Bornmann, P. L., Stencel, R. E., Antiochos, S. K., Golub, L., and Vaiana, G. S.: 1983,Astrophys. J., (in press).Google Scholar
  10. Johnson, H. M.: 1981,Astrophys. J. 243, 234.Google Scholar
  11. Johnson, H. M.: 1983, in P. Byrne and M. Rodonó (eds.),Activity in Red Dwarf Stars, D. Reidel Publ. Co., Dordrecht, Holland, p. 109.Google Scholar
  12. Jones, B. F.: 1981,Astron. J. 86, 290.Google Scholar
  13. Kilyachkov, N. N. and Shevchenko, V. S.: 1978,Soviet Astron. Letters 4, 224.Google Scholar
  14. Krasnobabtsev, V. I. and Gershberg, R. E.: 1975,Izv. Crimean Astrophys. Obs. 53, 154.Google Scholar
  15. Kodaira, K. and Ichimura, K.: 1982,Publ. Astron. Soc. Japan 34, 21.Google Scholar
  16. Kunkel, W. E.: 1970,Astrophys. J. 161, 503.Google Scholar
  17. Kunkel, W. E.: 1973,Astrophys. J. Suppl. Ser. 25, No. 213, 1.Google Scholar
  18. Lacy, C. H., Moffett, T. J., and Evans, D. S.: 1976,Astrophys. J. Suppl. Ser. 30, 85.Google Scholar
  19. Linsky, J. L., Bornmann, P. L., Carpenter, K. G., Wing, R. F., Giampapa, M. S., Worden, S. P., and Hege, E. K.: 1982,Astrophys. J. 260, 670.Google Scholar
  20. Moffett, T. J.: 1974,Astrophys. J. Suppl. Ser. 29, No. 273, 1.Google Scholar
  21. Moffett, T. J.: 1975,Inf. Bull. Var. Stars, No. 997.Google Scholar
  22. Pettersen, B. R.: 1980,Astron. Astrophys. 82, 53.Google Scholar
  23. Shakhovskaya, N. I.: 1974a,Izv. Crimean Astrophys. Obs. 50, 84.Google Scholar
  24. Shakhovskaya, N. I.: 1974b,Izv. Crimean Astrophys. Obs. 51, 92.Google Scholar
  25. Shakhovskaya, N. I.: 1979,Izv. Crimean Astrophys. Obs. 60, 14.Google Scholar
  26. Stern, R. A., Zolcinski, M. C., Antioches, S. K., and Underwood, J. H.: 1981,Astrophys. J.,249, 647.Google Scholar
  27. Swank, J. H. and Johnson, H. M.: 1982,Astrophys. J. 259, L67.Google Scholar
  28. Tsikoudi, V.: 1982,Astrophys. J. 262, 263.Google Scholar
  29. Vaiana, G. S., Cassinelli, J. P., Fabbiano, G., Giacconi, R., Golub, L., Gorenstein, P., Haisch, B. M., Harnden, F. R., Johnson, H. M., Linsky, J. L., Maxson, C. W., Mewe, R., Rosner, R., Seward, F., Topka, K., and Zwaan, C.: 1981,Astrophys. J. 245, 163.Google Scholar
  30. Vogt, S. S.: 1983, in P. Byrne and M. Rodonó (eds.),Activity in Red Dwarf Stars, D. Reidel Publ. Co., Dordrecht, Holland, p. 137.Google Scholar

Copyright information

© D. Reidel Publishing Co. 1983

Authors and Affiliations

  • R. E. Gershberg
    • 1
  • N. I. Shakhovskaya
    • 1
  1. 1.Crimean Astrophysical ObservatoryNauchnyCrimea, USSR

Personalised recommendations