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Multiple spiral branches on late AGB stars

Multiple spiral branches on late AGB stars. Qian Wang Iowa State University. LL pagasi (Sahai 2010). Sahai 2006. Model method. Bowen code. Passing planet. +. Bowen code. 1-D code with Lagrange zoning. Hydrodynamic and thermodynamic equation without magnetic field.

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Multiple spiral branches on late AGB stars

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  1. Multiple spiral branches on late AGB stars Qian Wang Iowa State University

  2. LL pagasi (Sahai 2010) Sahai 2006

  3. Model method Bowen code Passing planet +

  4. Bowen code • 1-D code with Lagrange zoning. • Hydrodynamic and thermodynamic equation without magnetic field. • Atmosphere is driven by a sinusoidal piston below photosphere. • Density dependent thermal relaxation and Hydrogen cooling at high temperature • Radiation on dust grain and molecules

  5. Companion characters • The companion is on a circular orbit. • The mass of the companion ~ 10Mjupiter • The size of the companion is determined by the average Jupiter density. • The companion has no collision cross section but only gravity.

  6. Model parameters

  7. Model parameters

  8. Origin of super shocks Super shock clustering Shock speed vs Shock Density

  9. Shock effects Weak shocks and Temp. Contour Strong shocks and Temp. contour

  10. Shock effects Strong shocks and Molecular accel. contour Strong shocks and dust accel. contour

  11. Model analysis Extended density contour of Model 5 at time = 1200 cycles Density Profile at time = 700 cycles Model 6 Model 5 Model 4 Model 3

  12. 3 spiral arms Density color map of Model 5 Kinetic Temperature map of Model 5

  13. Density color map R(cm) Time (cycle)

  14. 4 spiral arms Density color map of Model 2 Density color map of Model 1

  15. 4 spiral arms Density Profile at time = 700 cycles Model 1 Density Profile at time = 700 cycles Model 2

  16. 2 spiral arms Density color map of Model 7 Density color map of Model 8

  17. 2 spiral arms Density Profile at time = 700 cycles Model 7 Density Profile at time = 700 cycles Model 8

  18. 1 spiral arm Density color map of Model 9 Density color map of Model 10

  19. 1 spiral arm Density Profile at time = 700 cycles Model 9 Density Profile at time = 700 cycles Model 10

  20. Equation for super shocks

  21. Observation results IRC-10216 (Mauron & Huggins 2000)

  22. Questions and suggestions Maybe I can explain this

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