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EP: Fachverband Extraterrestrische Physik

EP 14: Astrophysics: Stellar Astrophysics

EP 14.7: Talk

Friday, March 24, 2023, 12:45–13:00, HSZ/0004

Emulation of density and temperature structures in front of astrospheres: an incompressible approach — •Dieter H. Nickeler — Astronomical Institute, Czech Academy of Sciences, Ondrejov, Czech Republic

Stars with their winds traveling through the interstellar medium (ISM) can form stellar wind cavities called astrospheres, separating the ISM gas from the inner stellar wind material by the astropause. By using the Grad-Shafranov equation (GSE) formalism, based on the stream function method of Langrange and Stokes for incompressible hydrodynamics, we compute possible density and temperature profiles in the vicinity of the astropause. We start with a simple, single X-type stagnation point. By variation of the density function, where the density depends on the stream function only, it is possible to construct a huge variety of temperature profiles, with fixed pressure, automatically guaranteed by the fulfillment of the GSE. These profiles in density and temperature are essential for calculating expressions, with which synthetic radiation profiles from the regions in front of the astropause nose can be computed and compared to observations.