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Information × Registration Number 0220U101730, 0114U006632 , R & D reports Title Spectroscopic analysis of late-type stars and ultracool dwarfs of the Galaxy popup.stage_title Head Lyubchik Yuriy P., Кандидат фізико-математичних наук Registration Date 19-02-2020 Organization Main Astronomical Observatory popup.description2 Comprehensive studies of spectra of different types of stars and spectra of ultra-cool dwarfs of the Galaxy have been carried out in this work. On the basis of theoretical spectra fitting to observational data, the physical state of their atmospheres and the evolutionary changes of fundamental characteristics were investigated. Such studies allow us to test current concepts of the nature of such objects and distribution and evolution of chemical elements in the Universe. The work carried out is based on the use of modern methods of chemical equilibrium modeling in the atmospheres of late type stars, calculations of synthetic spectra, taking into account specific sources of opacity. These sources include the opacities caused by the absorption in lines of polyatomic molecules. The processes of spectra formation in atmospheres of objects with low effective temperatures are significantly different from the case of solar-type stars, which was taken into account when calculating the spectra of ultra-cool objects.  Product Description popup.authors Ivanyuk Oleksiy M. Butkovska Varvara V. Kaminskiy Bogdan M. Lyubchyk Yuriy P. Pavlenko Yakiv V. Plachinda Sergiy I. Rosenbush Oleksandr E. Shavrina Angelina V. Sheminova Valentina A. Yakovina Larisa Ya. popup.nrat_date 2020-04-02 Close