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PHOTOMETRIC AND SPECTRAL OBSERVATIONS OF P CYGNI, THE LUMINOUS BLUE VARIABLE

We found original observations by E. Kharadze and N. Magalashvili of P Cygni in the archives of Abastumani Astrophysical Observatory.  These observations were carried out during 1951-1983 period. Initially, they used 29 Cygni as comparison star and all observations of P Cygni were processed using this star. On the basis of their calculations, authors decided that P Cygni may be a W UMa type binary with orbital period of 0.500565, but this hypothesis was not confirmed. There is a whole set of observational data.  So, we recalculated all data (where it was possible) using 36 Cygni as a comparison star. Besides, we are going to present the results of the new photometric observations of the P Cygni and new spectral observation. New photometric observations were obtained in 2014 using 48 cm Cassegrain telescope of Abastumani Observatory. Some interesting behaviors of the light curves were revealed. New spectral observation was obtained of the University Observatory Jena, in Germany where we clearly can see stellar variability.