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Information × Registration Number 0214U003519, 0111U001087 , R & D reports Title Determination of the physical characteristics and chemical composition of the nuclei and envelopes of the planetary nebulae popup.stage_title Head Vavrukh Markiyan Vasylyovych, Registration Date 05-02-2014 Organization Ivan Franko National University of Lviv popup.description2 Under financial support of the government grant FA-87F the new approach to the investigation of the physical state of matter as well as to calculation of the physical characteristics of the degenerated dwarfs was developed. The optimal approximation expression for the description of the radial distribution of the hydrogen density in planetary nebula (PN) envelope was proposed. This expression was obtained previously using density distributions calculated from analysis of the observed isophotes of PNe envelopes. Using this representation the photoionization models grid of the PNe containing the dust grains was calculated. The credibility of this grid results was analysed on the base of the comparison of synthetic "color - color" diagrams in IR with observed ones. Using diagnostics method the electron temperatures and densities as well as ionic abundances in PN envelopes were determined. On the base of the ionic abundances the chemical abundances in PN envelopes were determined using latest expressions for the ionization-correction factors. The new method to the simultaneous determination of the PN envelope mass and distances to ones based on the optimized photoionization modelling (OPhM) of its emission. Using OPhM method the parameters of the nuclei, the radial density distributions, the chemical compositions as well as masses of the selected PNe with distances to ones were determined. Product Description popup.authors Боднар М. Воробець Надія Казимирівна Головатий Володимир Володимирович Коритко Роман Іванович Мелех Богдан Ярославович Смеречинський Святослав Всеволодович Тишко Нестор Любомирович popup.nrat_date 2020-04-02 Close