Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phdt........11g&link_type=abstract
Thesis Tuebingen Univ. (Germany, F.R.). Astronomisches Inst.
Astronomy and Astrophysics
Astronomy
Gas Dynamics, Ionization, Planetary Nebulae, Stellar Models, Electron Density (Concentration), Recombination Reactions, Stellar Winds, White Dwarf Stars
Scientific paper
Several models for the description of the development of planetary nebulae are discussed from the theory of the ionization of rarefied gases and the gas dynamics. Some three-wind-models are calculated by means of a program that can simulate the dynamic development of such a nebula by unidimensional geometry with spheric symmetry. It is shown that the development of such nebulae has four phases: early ionization, recombination, and late phase. With reference to the ionized part of the nebula, the mean expansion velocity, the mean electron density and the luminous power are compared with the observed values. The assumption of the spherical symmetry is too superficial to reproduce the complex appearance forms of the planetary nebulae which may need two or three dimensional models, that allow instabilities and mass condensation to be taken into account.
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