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Dynamical Origin of Wind Structure

Dynamical Origin of Wind Structure. Stan Owocki Bartol Research Institute Department of Physics & Astronomy University of Delaware. The effect of “velocity porosity” on P-Cygni line absorption strength. Key Issues. What is effect of wind clumping on line-absorption?

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Dynamical Origin of Wind Structure

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  1. Dynamical Origin of Wind Structure Stan Owocki Bartol Research Institute Department of Physics & Astronomy University of Delaware The effect of “velocity porosity” on P-Cygni line absorption strength

  2. Key Issues • What is effect of wind clumping on line-absorption? • Velocity dispersion vs. Spatial Porosity • What are relevant scaling parameters (cf. fr, h=l/f)? • In dynamical model, how important for, eg. PV?

  3. Spatial Porosity • Same amount of material • More light gets through • Less interaction between matter and light Incident light

  4. porosity length=h Effective opacity

  5. l=0.05r l=0.1r l=0.2r Porous envelopes h=0.5r hºl/f h=r h=2r

  6. Step function Profile-weighted line column depth

  7. b=1 t¥=1/4 1/2 1 2 Line absorption trough

  8. Velocity vs. Mass

  9. Velocity vs. Mass } DV Velocity filling factor : dv }

  10. Velocity vs. Mass

  11. Vorosity? “Velocity Porosity”

  12. Absorption reduction f = 1 RA 0.5 0.2 0.1 tx

  13. smooth, b=1 porous, fv = 1-v/2v¥ t=1/4 t=1/4 1/2 1 2 1 2 Line absorption

  14. Line-Driven Instabilty sim (SSF)

  15. 4 4 Time (days) 0 1 10 radius (R*) 0 1 10 radius (R*) Velocity Instability model Density CAK init. cond.

  16. Profile-weighted line column depth 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  17. Profile-weighted line column depth 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  18. Dynamic absorption spectrum-weak line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  19. Dynamic absorption spectrum-weak line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  20. Dynamic absorption spectrum - med. line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  21. Dynamic absorption spectrum - med. line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  22. Dynamic absorption spectrum-strong line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  23. Dynamic absorption spectrum-strong line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  24. Weak Medium Strong Time-Averaged Absorption Profiles 1 I /Icont 0 -1 0 Wavelength (V¥)

  25. Weak Medium Strong Time-Averaged Absorption Profiles 1 I /Icont 0 -1 0 Wavelength (V¥)

  26. Weak Medium Strong Dynamic absorption spectra 0 -1 0 0 -1 -1 Wavelength (V¥) 0 -1 0

  27. Summary • Spatial porosity for continuum opacity • characterized by “porosity length” h=l/fr • But for line opacity, key is“velocity clumping” • characterized by fvel(and tSob of smoothed wind) • Line-driven instability suggests: • fvel ~= 0.7-0.8 (maybe 0.5 if seeded by low freq. pert) • Mdot misunderestimated by fvel , i.e. 0.5-0.8 • Maybe upto a factor 2 of the ca. 10 needed for PV

  28. nonlocal structured model 2D Simulation of Co-rotating Interaction Regions D log(Density) c. a. b. nonlocal local smooth CAK model model

  29. Profile-weighted line column depth 8 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  30. Dynamic absorption spectrum-med. line 8 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  31. Dyn. abs. spectrum - very strong line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  32. Dyn. abs. spectrum - very strong line 4 Time (days) 0 CAK init. cond. -1 0 Wavelength (V¥)

  33. Instability model: Mdot 4 Time (days) 0 CAK init. cond. 1 radius (R*) 10

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