1. Alpha Disc Model in Accretion Disks Hongyu Gong Xiamen University

2. 1. Background 2. Analysis 3. Numerical method 4. Conclusion

3. Accretion Disks An accretion disc is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body.

4. Accretion Disks

5. α-Disc Model By using the equation of hydrostatic equilibrium, combined with conservation of angular momentum and assuming that the disc is thin, the equations of disk structure may be solved in terms of the parameter.

6. Equations

7. Parameters and Boundary Conditions

8. Numerical Method

9. f1(p,Fz,T)=-3*kes*p*Fz/(4*c*a*T*T*T); f2(p,T)=alpha*(p*kb*T/(u*mp)+1/3*a*T*T*T* T)*W*g; f3(p,Fz,T)= p*u*mp/(T*kb)*(kes*Fz/c- W*W*z)+3*kes*p*p*Fz/(4*c*a*T*T*T*T);

10. Numerical Method

11. Solutions T-z

12. Solutions rho-z

13. Solutions Fz-z

14. Solutions

15. Thank you!