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

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Presentation on theme: "Multiple spiral branches on late AGB stars Qian Wang Iowa State University."— Presentation transcript:

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

2 LL pagasi (Sahai 2010) Sahai 2006

3 Model method Bowen codePassing 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 Mass(Msun)1 Luminosity(Lsun)5000 T(K)2966 R(Rsun)267.8 Vterminal(km/s at 18R*)9.35km/s Mdot(Msun/yr)1.25e-6 Pulsation period (day)394 Pulsation Amp.(km/s)3.974km/s

7 Model parameters Model NO.Mp(Mjupit er) D (Rstar)Porb (days)# of spiralsTss (Ppuls) 1 21.01889522.43460 2 51.01889522.43460 3 51.1586.1360 4 81.1586.1360 5 101.1586.1360 6 121.1586.1360 7 101.325775.082260 8 101.339786.942400 9 1012.9423640160 10 2018.187394001100

8 Origin of super shocks Super shock clusteringShock speed vs Shock Density

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

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

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

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

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

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

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

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

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

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

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