On Quasi-Periodic Brightness Variations of P Cygni
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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.
KeywordsUBV photometry Luminous Blue Variables P Cygni
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- 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
- 15.M. J. H. de Groot, Commun. Konkoly Observ., 65, 203, 1969.Google Scholar
- 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
- 20.V. B. Nikonov, Bull. AbAO, 1, 35, 1937.Google Scholar
- 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
- 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.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.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.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.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