Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.........3s&link_type=abstract
Ph.D. Thesis - Tuebingen Univ. Max-Planck-Inst. für Physik und Astrophysik, Garching (Germany). Inst. für Extraterrestrische Phy
Astronomy and Astrophysics
Astrophysics
Accretion Disks, Interplanetary Dust, Mathematical Models, Protoplanets, Spectral Energy Distribution, Stellar Evolution, Stellar Gravitation, Stellar Models, Couette Flow, Finite Difference Theory, Hill Lunar Theory, Hydrodynamics, Kepler Laws, Lagrangian Equilibrium Points, Opacity, Stellar Envelopes, Turbulent Flow, Viscosity
Scientific paper
The spatial and temporal development of protoplanetary accretion disks is investigated. Flat, homogeneous, mixed gas/dust disks with interstellar elementary frequencies, whose motion is estimated by the gravitation field of the central object, are considered as a starting point. The existence of the turbulent viscosity was assumed with the alpha parameterization for determining spectral energy distribution of radiation emitted at disk surface. Local vertical disk structure was estimated with the approximation of gray atmospheres and allowed the coupled system to be self consistently treated. One dimensional, radial time development calculations show that the radial surface temperature variation due to dust opacity modification is only transient. If preferential particle growth is only considered in main condensation zones, radial development calculations show a strong increase of column thickness in radially limited areas. Two dimensional development calculations were carried out in order to estimate radial and axial structures of protoplanetary accretion disks; a numerical process was introduced in a particle simulation for the treatment of shear viscosity. In a local simulation, a cutting of a viscous Kepler disk was considered and the eigen gravitation was taken into account, so that the ring instability predicted with a linear theory is found.
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