Old and New Observational Data of P Cygni

Abstract

Luminous Blue Variables (LBV) are extremely rare and enigmatic stars on the short-lived evolutionary phase with different variation scales of brightness and spectrum. Some of them are confirmed binary systems and even secondary components have found by direct imaging. The blue supergiant P Cygni is one of the prototypes of Luminous Blue Variables, showing photometric and spectroscopic variability on various timescales. We are going to present results of the old and new photometric observations of P Cygni. Old 1951-1983 years photometric observations were made by E. Kharadze and N. Magalashvili in the Abastumani Astrophysical Observatory, Georgia, which we found, recalculated and made conclusion that the star should undergo the next great eruption in some 100 years. New observations were obtained in 2014, using the 48 cm Cassegrain telescope of the Abastumani Observatory. Some interesting behaviors of the light curves were revealed.