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Polarimetry of Stellar Active Regions and Flares

  • I. Tuominen
  • J. Huovelin
  • Yu. S. Efimov
  • N. M. Shakhovskoy
  • A. G. Shcherbakov
Conference paper

Abstract

Observations of regular and irregular polarimetric variability in late-type stars are reviewed, and the related physical and geometrical effects are discussed. There are indications that the irregular part of the variability could be caused by transient events, possibly associated with flares. Polarimetric observations during flares are reviewed, and preliminary results of new observations of a well-known flare star, YY Geminorum, are presented. The results show that the small flare in YY Gem did not cause any significant variations in linear polarization, while the binary eclipse evidently causes an enhancement in the polarization. The reasons for the difficulties in stellar flare polarimetry are discussed. Finally, future prospects for the observations of flaring stars and for the utilization of linear polarimetry as a complementary method to other techniques of surface imaging of stellar activity and flares are presented.

Keywords

Linear Polarization Rotational Modulation Crimean Astrophysical Observatory Phase Phase Polarimetric Observation 
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.

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References

  1. Barbour, M. S. and Kemp, J. S.: 1981, Astrophys. J. 246, 203.ADSCrossRefGoogle Scholar
  2. Blanco, C., Catalano, S., and Marini, E.: 1979, Astron. Astrophys. Suppl. 36, 297.ADSGoogle Scholar
  3. Brandenburg, A. and Tuominen, I.: 1988, Adv. Space Res. 7, 185.ADSCrossRefGoogle Scholar
  4. Bopp, W. B.: 1974, Astrophys. J. 193, 389.ADSCrossRefGoogle Scholar
  5. Bopp, W. B., Africano, J. L., Stencel, R. E., Noah, P. V., and Klimke, A.: 1983, Astrophys. J. 275, 691.ADSCrossRefGoogle Scholar
  6. Brown, J. C., Mclean, I. S., and Emslie, A. G.: 1978, Astron. Astrophys. 68, 415.ADSGoogle Scholar
  7. Cassinelli,. P. and Haisch, B. M.: 1974, Astrophys. J. 188, 101.ADSCrossRefGoogle Scholar
  8. Chugainov, P. F.: 1980, Izv. Krymsk. Astrofiz. Obs. 61, 124.ADSGoogle Scholar
  9. Clayton, G. C. and Martin, P. G.: 1981, Astron. J. 86, 1518.ADSCrossRefGoogle Scholar
  10. De Jager, C., Heise, J., Avgoloupis, S., Cutispoto, G., Kieboom, K., Herr, R. B. et al.: 1986,Astron. Astrophys. 156, 95.ADSGoogle Scholar
  11. Efimov, Yu. S.: 1968, in L. Detre (ed.), `Non-Periodic Phenomena in Variable Stars’, IAU Colloq., p. 169.Google Scholar
  12. Efimov, Yu. S. and Shakhovskoy, N. M.: 1972, Izv. Krymsk. Astrofiz. Obs. 45, 111.ADSGoogle Scholar
  13. Eritsian, M. A.: 1978, Soobshch. Byurakansk. Obs. Akad. Nauk Arm. S.S.R. 50, 40.ADSGoogle Scholar
  14. Ginzburg, V. I. and Syrovatskii, S. I.: 1964, The Origin of Cosmic Rays, Mac Millan, New York.Google Scholar
  15. Grinin, V. P. and Domke, H.: 1971, Astrofizika 7, 211.ADSGoogle Scholar
  16. Huovelin, J., Saar, S. H., and Tuominen, I.: 1988, Astrophys. J. 329, 882.ADSCrossRefGoogle Scholar
  17. Huovelin, J., Linnaluoto, S., Piirola, V., and Tuominen, I.: 1985, Astron. Astrophys. 152, 357.ADSGoogle Scholar
  18. Huovelin, J., Linnaluoto, S., Piirola, V., and Tuominen, I.: 1986, in M. Zenik and D. M. Gibson (eds.), Cool Stars, Stellar Systems and the Sun, Springer-Verlag, New York, p. 333.CrossRefGoogle Scholar
  19. Huovelin, J., Piirola, V., Vilhu, O., Efimov, Yu. S., and Shakhovskoy, N. M.: 1987, Astron. Astrophys. 176, 83.ADSGoogle Scholar
  20. Huovelin, J., Piirola, V., Vilhu, O., Efimov, Yu. S., and Shakhovskoy, N. M.: 1987, Astron. Astrophys. 176, 83.ADSGoogle Scholar
  21. Jetsu, L., Huovelin, J., Vilhu, O., Tuominen, I., Linnaluoto, S., Savanov, I., Shakhovskoy, N. M., and Efimov, Yu. S.: 1989, Astron. Astrophys. (submitted).Google Scholar
  22. Joy, A. H. and Abt, H. A.: 1974, Astrophys. J. Suppl. 28, 1.ADSCrossRefGoogle Scholar
  23. Karpen, J. T., Crannell, C. J., Hobbs, R. W., Maran, S. P., Moffett, T. J., and Bardas, D. et al.: 1977, Astrophys. J. 216, 479.ADSCrossRefGoogle Scholar
  24. Kemp, J. C. and Wolstencroft, R. D.: 1974, Monthly Notices Roy. Astron. Soc. 166, 1.ADSGoogle Scholar
  25. Koch, R. H. and Pfeiffer, R. J.: 1976, Astrophys. J. 204, L47.ADSCrossRefGoogle Scholar
  26. Kron, G. E.: 1952, Astrophys. J. 115, 301.ADSCrossRefGoogle Scholar
  27. Leroy, J.-L.: 1962, Ann. Astrophys. 25, 127.ADSGoogle Scholar
  28. Liu, X. and Tan, H.: 1987, Acta Astron. Sinica 28, 39.ADSGoogle Scholar
  29. Moffett, T. J. and Bopp, B. W.: 1971, Astrophys. J. 168, L117.ADSCrossRefGoogle Scholar
  30. Mullan, D. J.: 1975, Astrophys. J. 201, 630.ADSCrossRefGoogle Scholar
  31. Mullan, D. J. and Bell, R. A.: 1976, Astrophys. J. 204, 818.ADSCrossRefGoogle Scholar
  32. Noyes, R. W., Hartmann, L., Baliunas, S. L., Duncan, D. K., and Vaughan, A. H.: 1984, Astrophys. J. 279, 793.ADSCrossRefGoogle Scholar
  33. Pettersen, B. R. and Hsu, J.: 1981, Astrophys. J. 247, 1013.ADSCrossRefGoogle Scholar
  34. Pfeiffer, R. J.: 1979, Astrophys. J. 232, 181.ADSCrossRefGoogle Scholar
  35. Pfeiffer, R. J. and Koch, R. H.: 1973, Inf. Bull. Var. Stars, No. 780.Google Scholar
  36. Piirola, V.: 1973, Astron. Astrophys. 27, 383.ADSGoogle Scholar
  37. Piirola, V.: 1975, Ann. Acad. Sci. Fennicae AVI, No. 418.Google Scholar
  38. Piirola, V.: 1977, Astron. Astrophys. Suppl. Ser. 30, 213.ADSGoogle Scholar
  39. Piirola, V. and Vilhu, O.: 1982, Astron. Astrophys. 110, 351.ADSGoogle Scholar
  40. Piskunov, N., Tuominen, I., and Vilhu, O.: 1989, Astron. Astrophys. (submitted).Google Scholar
  41. Poeckert, R. and Marlborough, J. M.: 1976, Astrophys. J. 206, 182.ADSCrossRefGoogle Scholar
  42. Saar, S. H. and Huovelin, J. 1989, Astrophys. J. (submitted).Google Scholar
  43. Shakhovskoy, N. M.: 1965, Soviet Astron. A.J. 8, 833.ADSGoogle Scholar
  44. Struve, O. and Zebergs, V.: 1959, Astrophys. J. 130, 783.ADSCrossRefGoogle Scholar
  45. Struve, O., Herbig, G., and Horak, H.: 1950, Astrophys. J. 112, 216.ADSCrossRefGoogle Scholar
  46. Tinbergen, N. and Zwaan, C.: 1981, Astron. Astrophys. 101, 223.ADSGoogle Scholar
  47. Unno, W.: 1956, Publ. Astron. Soc. Japan 8, 108.ADSGoogle Scholar
  48. Van Gent, H.: 1931, Bull. Astron. Inst. Neth. 6, 99.ADSGoogle Scholar
  49. Warwick, J. W.: 1951, Proc. Nat. Acad. Sci. 35, 196.ADSCrossRefGoogle Scholar
  50. Weiler, E. J., Owen, F. N., Bopp, B. W., Schmitz, M., Hall, D. S., Fraquelli, D. A., Piirola, V., Ryle, M., and Gibson, D. M.: 1978, Astrophys. J. 225, 919.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • I. Tuominen
    • 1
  • J. Huovelin
    • 1
  • Yu. S. Efimov
    • 2
  • N. M. Shakhovskoy
    • 2
  • A. G. Shcherbakov
    • 2
  1. 1.Observatory and Astrophysics LaboratoryUniversity of HelsinkiHelsinkiFinland
  2. 2.Crimean Astrophysical ObservatoryCrimeaUSSR

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