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| Paper: |
Studying the Generation of Shock Waves in AGB Stars with 3-Dimensional Radiation–Hydrodynamics Simulations |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
23 |
| Authors: |
Freytag, B. |
| Abstract: |
In the Sun, low-amplitude small-scale acoustic waves are just
detectable in the photosphere and start to become dynamically
relevant only in the lower chromosphere.
The generation of these waves by non-stationary convective flows
can be studied in detail by local 3-D radiation-hydrodynamics
simulations. Using this technique for global models of AGB stars
reveals roughly similar phenomena but on a larger scale and with
much higher amplitude. Convection cells spanning a significant
fraction of the entire surface produce strong waves that cause
a network of smaller shocks in the inner photosphere and
occasional global shocks, travelling outward in large arcs.
Material falling back interacts with the surface convection cells.
A new generation of 3-D RHD simulations of these layers with
CO5BOLD is presented and analyzed with particular attention
given to acoustic waves and shock fronts. |
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