Search academic texts

Information × Registration Number 0210U004016, 0106U011687 , R & D reports Title Investigation of the ultracool objects and peculiar stars of Galaxy popup.stage_title Head Pavlenko Ya. V., Registration Date 02-02-2010 Organization Main Astronomical Observatory popup.description2 We carried out pioneering researches of physics of atmospheres of brown dwarfs and ultracool dwarf of our Galaxy. We determined the lithium sbundance in atmosphere of LP944-20, showed that this late spectral class M dwarf is a brown dwarf, we observe in its atmosphere lithium, which has survived since its formation. An method of calculation of profiles of the superstrong resonance absorption lines of potassium and sodium lines in the spectra ultraholodnyh dwarfs was developed. For infrared spectra of red giants from RS Oph system we determined the physical characteristics of its atmosphere using model atmospheres of peculiar giants calculated with account of the absorption of radiation by atoms and molecules, including polyatomic molecules. We determined the effective temperature (2900-3300 K) of DY Per which is C giant stars with the R CrB-like photometric parameters. For other atmospheric parameters we determined ranges of possible values. We determined the lithium abundance in the atmospheres of three carbon stars. We found higher than cosmic value lithium abundance, in three spots associated with the poles of the magnetic field in the atmosphere of the discovered the first roAp stars of the northern sky HD12098. A significant stratification of helium in the atmospheres of two He-weak stars HD21699 and HD35502 was determined. The study of properties of horizontal magnetic fields in the photosphere of the Sun using two sets of 2D MHD models of solar mahnitogranulation showed that in areas of strong and weak magnetic grid scale less than the spatial resolution of solar telescopes; horizontal magnetic fields prevail over vertical in 1.3 times, on average. Product Description popup.authors Камінський Богдан Мар'янович Любчик Юрій Петрович Михайлицька Нина Григорівна Павленко Яків Володимирович Пугач Олександр Федорович Шавріна Ангеліна Василівна Шемінова Валентіна Андріївна Яковина Лариса Якимівна popup.nrat_date 2020-04-02 Close