The dynamical evolution of planetary nebulae

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Schönberner, Detlef^1

Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam

14482, Germany^1

关键词: Doppler velocity;    Dynamical evolution;    Dynamical process;    Expanding materials;    Expansion properties;    Formation and evolutions;    Planetary nebulae;    Radiation hydrodynamics simulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/3/032001/pdf
DOI  :  10.1088/1742-6596/728/3/032001

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Based on modern 1D-radiation-hydrodynamics simulations of formation and evolution of planetary nebulae, I discuss in detail the basic dynamical processes responsible for the "grand design" of most planetary nebulae, i.e. their double-shell morphology and their typical expansion properties. Special emphasis is given for a proper definition of a nebula's true expansion rate and its relation to spectroscopically measurable Doppler velocities of the expanding material. It is found that the typical nebular expansion is about twice as fast as hitherto assumed, viz. 45 kms-1.