Massive Stars in Far and Near Galaxies

The process of formation of massive high-luminosity stars depends on many parameters: the size of the gas complex from which the stars are born, the metallicity of the parent gas and its density, the initial mass of the star, its binarity or multiplicity, the presence of nearby massive stars, etc. Massive stars evolve rapidly and we observe these stars at different stages of evolution in the form of bright stars of different types: OB stars, Wolf - Rayet stars, LBV stars and many subtypes of supergiants. Despite the existing theories of the evolution of massive stars, the evolutionary sequences they go through, turning from one type to another, remain unknown. The validity of theories can only be verified based on real data that can be obtained from observations of stars of different masses, ages, luminosities and metallicities. We have been studying exactly these stars for many years at the SAO RAS observatory and present the results and prospects for their study.