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On Quasi-Periodic Brightness Variations of P Cygni

  • Dedicated to the 110th anniversary of the academician E. Kharadze
  • Published:
Astrophysics Aims and scope

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.

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Authors and Affiliations

  1. E.Kharadze Abastumani Astrophysical Observatory, Ilia State University, Tbilisi, Georgia

    N. Kochiashvili, S. Beradze, R. Natsvlishvili, I. Kochiashvili, M. Vardosanidze & A. Pannicke

  2. Samtskhe-Javakheti State University, Akhaltsikhe, Georgia

    M. Vardosanidze

  3. Astrophysical Institute and University Observatory, Friedrich Schiller University, Jena, Germany

    A. Pannicke

Authors
  1. N. Kochiashvili
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  2. S. Beradze
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  3. R. Natsvlishvili
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  4. I. Kochiashvili
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  5. M. Vardosanidze
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  6. A. Pannicke
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Correspondence to N. Kochiashvili.

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Dedicated to the 110th anniversary of the academician E. Kharadze

Published in Astrofizika, Vol. 61, No. 1, pp. 31-40 (March 2018).

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Kochiashvili, N., Beradze, S., Natsvlishvili, R. et al. On Quasi-Periodic Brightness Variations of P Cygni. Astrophysics 61, 22–29 (2018). https://doi.org/10.1007/s10511-018-9512-2

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  • DOI: https://doi.org/10.1007/s10511-018-9512-2

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