Advertisement

Astrophysics

, Volume 61, Issue 1, pp 22–29 | Cite as

On Quasi-Periodic Brightness Variations of P Cygni

  • N. Kochiashvili
  • S. Beradze
  • R. Natsvlishvili
  • I. Kochiashvili
  • M. Vardosanidze
  • A. Pannicke
Dedicated to the 110th anniversary of the academician E. Kharadze

Until recent decades, it was considered that all Luminous Blue Variables are single massive and high luminosity stars. Now for several of them a companion has been found. The opinion exists that P Cygni also has a companion with an orbital period of about seven years. In accordance with this hypothesis, a known powerful eruption occurred near the periastron point. P Cygni, as well as several other well-known Luminous Blue Variable (LBV) stars, is a so-called "Supernova Impostor" because it survived after a powerful outburst. However, there were cases during the last decade when a LBV star survived after a powerful giant eruption, and then after a few years, explode as a supernova. Because the real reason for the great eruption and characteristic light variability of LBV, including P Cygni, is not established yet, any kind of photometric and spectral observational data is very significant. We present the results of analysis of the long-term photometric observations of hypergiant P Cygni. On the basis of these data, different quasi-periodic brightness changes of the star were revealed.

Keywords

UBV photometry Luminous Blue Variables P Cygni 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. Szécsi, N. Langer, S.-Ch. Yoon et al., Astron. Astrophys., 581, 15, 2015.CrossRefGoogle Scholar
  2. 2.
    Z. Haiman and A. Loeb, Astrophys. J., 483, 21, 1997.ADSCrossRefGoogle Scholar
  3. 3.
    P. Conti, IAU Proc. Symp. 105, "Observational Tests of the Stellar Evolution Theory". Geneva, Switzerland, September 12-16, 1983. Eds., A.Maeder, A.Renzini; Publisher, D.Reidel Publishing Company, Dordrecht, The Netherlands, Boston, MA, Hingham, MA, 1984, p.233.Google Scholar
  4. 4.
    C. Chiosi and A. Maeder, Ann. Rev. Astron. Astrophys., 24, 329, 1986.ADSCrossRefGoogle Scholar
  5. 5.
    R. Humphreys and K. Davidson, Publ. Astron. Soc. Pacif., 106, 1025, 1994.ADSCrossRefGoogle Scholar
  6. 6.
    Ph. Massey, Astrophys. J., 238, 93, 2006.CrossRefGoogle Scholar
  7. 7.
    G. Israelian and M. de Groot, Space Sci. Rev., 90, 493, 1999.ADSCrossRefGoogle Scholar
  8. 8.
    M. J. H. de Groot and H. J. G. L. M. Lamers, Nature, 355, 422, 1992.ADSCrossRefGoogle Scholar
  9. 9.
    M. J. Barlow and M. Cohen, Astrophys. J., 213, 737, 1977.ADSCrossRefGoogle Scholar
  10. 10.
    F. Najarro, G. Hillier, and O. Stahl, Astron. Astrophys., 326, 1117, 1997.ADSGoogle Scholar
  11. 11.
    W. H. McCrea, The Observatory, 52, 267, 1929.ADSGoogle Scholar
  12. 12.
    C. S. Beals, J. Roy. Astron. Soc. Canada, 24, 277, 1930.ADSGoogle Scholar
  13. 13.
    C. S. Beals, J. Roy. Astron. Soc. Canada, 44, 221, 1950.ADSGoogle Scholar
  14. 14.
    J. B. Hutchings, Mon. Not. Roy. Astron. Soc., 144, 235, 1969.ADSCrossRefGoogle Scholar
  15. 15.
    M. J. H. de Groot, Commun. Konkoly Observ., 65, 203, 1969.Google Scholar
  16. 16.
    O. Stahl, New Aspects of Magellanic Cloud research; European meeting on the Magellanic Cloud, 2nd, SFB No. 328 "Evolution of Galaxies", Heidelberg, Germany. June 15-17, 1992. p.263, 1993.Google Scholar
  17. 17.
    N. Markova, Astron. Astrophys. Suppl., 108, 561, 1994.ADSGoogle Scholar
  18. 18.
    A. M. van Genderen, Astron. Astrophys., 366, 508, 2001.ADSCrossRefGoogle Scholar
  19. 19.
    A. M. van Genderen, C. Sterken, and M. J. H. de Groot, Astron. Astrophys. Suppl., 124, 517, 1997.ADSCrossRefGoogle Scholar
  20. 20.
    V. B. Nikonov, Bull. AbAO, 1, 35, 1937.Google Scholar
  21. 21.
    S. Beradze, N. Kochiashvili, I. Kochiashvili et al., In Proceedings of the Byurakan-Abastumani Colloquium dedicated to Ludwik Mirzoyan's 90th anniversary, held on 26-28 August 2013 in Byurakan Astrophysical Observatory, Armenia. Eds.: H.A.Harutyunian, E.H.Nikoghosyan, N.D.Melikian, Yerevan, "Gitutyun" Publishing House of the NAS RA, 10, 2014.Google Scholar
  22. 22.
    N. Magalashvili and E. Kharadze, IBVS, 210, 1, 1967.ADSGoogle Scholar
  23. 23.
    J. D. Fernie, Observatory, 88, 167, 1968.ADSGoogle Scholar
  24. 24.
    T. Alexander and G. Wallerstein, Publ. Astron. Soc. Pacif., 79, 500, 1967.ADSCrossRefGoogle Scholar
  25. 25.
    L. Luud, Communic. Konkoly Observ., 65, 197, 1969.ADSGoogle Scholar
  26. 26.
    S. Beradze, N. Kochiashvili, I. Kochiashvili et al., In Proceedings of an International Workshop held in Potsdam, Germany, 1-5 June 2015. Eds. WR.Hamann, A.Sander, H.Todt. Universitätsverlag Potsdam, 353, 2015.Google Scholar
  27. 27.
    M. de Groot, C. Sterken, and A. M. van Genderen, ASP Conference Proceedings, 233, Eds. M. de Groot and C. Sterken, San Francisco: Astronomical Society of the Pacific, 15, 2001.Google Scholar
  28. 28.
    A. N. Cox, J. A. Guzik, M. S. Soukup, and K. M. Despain, A Half Century of Stellar Pulsation Interpretation: A Tribute to Arthur N. Cox, Eds. P.A.Bradley and J.A.Guzik, Proceedings of a Conference held in Los Alamos, NM, 16-20 June 1997, ASP Conference Series, #135, 302, 1998.Google Scholar
  29. 29.
    N. Kochiashvili, S. Beradze, I. Kochiashvili et al., In Proceedings of an International Workshop held in Potsdam, Germany, 1-5 June 2015. Eds. WR.Hamann, A.Sander, H.Todt, Universitätsverlag Potsdam, 360, 2015.Google Scholar
  30. 30.
    N.Kochiashvili, S.Beradze, I.Kochiashvili et al., In Proceedings IAU Symposium No. 329, 2016, "Lives and death-throes of massive stars", 407, 2017.Google Scholar
  31. 31.
    A. Kashi, Mon. Not. Roy. Astron. Soc., 405, 1924, 2010.ADSGoogle Scholar
  32. 32.
    H. J. G. L. M. Lamers, M. de Groot, and A. Cassatella, Astron. Astrophys., 128, 299, 1983.ADSGoogle Scholar
  33. 33.
    M. de Groot, Irish Astron. J., 18, 163, 1988.ADSGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • N. Kochiashvili
    • 1
  • S. Beradze
    • 1
  • R. Natsvlishvili
    • 1
  • I. Kochiashvili
    • 1
  • M. Vardosanidze
    • 1
    • 2
  • A. Pannicke
    • 1
    • 3
  1. 1.E.Kharadze Abastumani Astrophysical ObservatoryIlia State UniversityTbilisiGeorgia
  2. 2.Samtskhe-Javakheti State UniversityAkhaltsikheGeorgia
  3. 3.Astrophysical Institute and University Observatory, Friedrich Schiller UniversityJenaGermany

Personalised recommendations