Bonn 2020 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 11: Astrophysics I

EP 11.6: Talk

Thursday, April 2, 2020, 18:00–18:15, H-HS VIII

Hydrodynamical Models of Circumstellar Ring and Spiral Structures — •Dieter Nickeler and Michaela Kraus — Astronomical Institute, Czech Academy of Sciences, Ondrejov, Czech Republic

Spiral arms, interrupted spiral arms, so-called arcs, and ring structures have been observed in the vicinity of evolved (massive) stars. Such highly structured material, being the result of eruptive mass-loss episodes, possibly reflects complex geometrical flow structures around these stars. To model these flows geometrically, we solve non-linear Poisson equations, which are a mathematical equivalent formulation of the Euler equation and additional constraints. The equations are treated with conformal and non-conformal mappings, a well-suited technique from magneto-hydrostatics. Preliminary results for selected geometries are presented.