7–11 Jul 2025
University of the Witwatersrand, Johannesburg
Africa/Johannesburg timezone
Registration open until 20 May 2025

MHD simulations of Lambda Cephei like astrospheres

Not scheduled
2h 50m
Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Solomon Mahlangu House

University of the Witwatersrand, Johannesburg

Poster Presentation Track D1 - Astrophysics Poster Session

Speaker

Mr Christo Pretorius (Centre for Space Research, North-West University, Potchefstroom Campus, Potchefstroom, 2520, South Africa)

Description

In this work simulations of the interaction of a stellar wind with the interstellar medium, which forms an astrospheric cavity, are presented. Results are shown where the astrosphere of Lambda Cephei is simulated for three different scenarios, corresponding to three different ISM speeds. The results can be visualized as density contour plots as well as radial profiles for different simulation periods. From these results, as the ISM speed increases, the astrospheres become more compressed and more bullet-shaped due to the increasing ISM ram pressure which reduces the bow shock and termination shock distances. Also shown are the importance of radiative cooling on astrospheric evolution. The inclusion of this process in magneto-hydrodynamic simulations result in a thinner outer astrospheric shell due to a decrease in thermal pressure.

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Primary author

Mr Christo Pretorius (Centre for Space Research, North-West University, Potchefstroom Campus, Potchefstroom, 2520, South Africa)

Co-author

Prof. Stefan Ferreira (Centre for Space Research, North-West University, Potchefstroom Campus, Potchefstroom, 2520, South Africa)

Presentation materials

There are no materials yet.