1 / 43

Magnetic Channeling and Confinement in the Hypersonic Winds of Massive, Luminous Stars

Rich Townsend University of Delaware Stan Owocki Asif ud-Doula Mary Oksala David Cohen Marc Gagné Steve Skinner. Magnetic Channeling and Confinement in the Hypersonic Winds of Massive, Luminous Stars. ESO Chile ̶ November 2006. Overview. - σ Ori E. - θ 1 Ori C. Luminous.

shannon-anthony
Télécharger la présentation

Magnetic Channeling and Confinement in the Hypersonic Winds of Massive, Luminous Stars

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Rich Townsend University of Delaware Stan Owocki Asif ud-Doula Mary Oksala David Cohen Marc Gagné Steve Skinner Magnetic Channeling and Confinement in the Hypersonic Winds of Massive, Luminous Stars ESO Chile ̶ November 2006

  2. Overview - σ Ori E - θ1 Ori C

  3. Luminous

  4. Radiation-driven wind

  5. CNO cycle

  6. Convective core

  7. Radiative envelope

  8. magnetic field ? No * 1978 2002 2005

  9. Plasma Physics Stellar Evolution Compact Objects Circumstellar Environment

  10. θ1 Orionis C

  11. - θ1 Ori C (O5.5) θ Ori - Chandra ACIS-S Feigelson et al. (2002)

  12. 107 K / 1 keV / 1,000 km s-1 θ1 Ori C ζ Pup Wojdowski & Schulz (2005)

  13. Magnetically Confined Wind Shock Babel & Montmerle (1997)

  14. ZEUS - Density ud-Doula & Owocki (unpub.)

  15. ZEUS - Temperature ud-Doula & Owocki (unpub.)

  16. 107 K / 1 keV / 1,000 km s-1 Gagné et al. (2005)

  17. ZEUS - Density ZEUS - Temperature ud-Doula & Owocki (unpub.)

  18. . η = [B*R*/Mv∞] (r/R*) -4 2 2 η* rA/R* = η* 1/4 Magnetic Confinement η = B2/8π / ρv2/2

  19. ZEUS - Density ZEUS - Temperature ud-Doula & Owocki (unpub.)

  20. ! Field Strength Rotation Rate Mass-Loss Rate

  21. σOrionis E

  22. - σ Ori E (B2) σ Ori D (B2) - - σ Ori AB (O9.5 + B0.5) σ Ori - Chandra ACIS-S Skinner et al. (2004)

  23. 107 K / 1 keV / 1,000 km s-1 σ Ori AB σ Ori E σ Ori - Chandra ACIS-S Skinner et al. (2004)

  24. Landstreet & Borra (1978) Bohlender et al. (1987) Hesser et al. (1977)

  25. Kaufer et al. (1999)

  26. “ two more or less isolated clouds … near the intersection of the magnetic and rotational equator ” Groote & Hunger (1982)

  27. Field lines are almost rigid Field lines are almost rigid

  28. Rigidly Rotating Magnetosphere Townsend & Owocki (2005)

  29. Townsend, Owocki & Groote (2005)

  30. Townsend, Owocki & Groote (2005)

  31. Rigid Field Hydrodynamics Townsend, Owocki & ud-Doula (in prep.)

  32. Townsend, Owocki & ud-Doula (in prep.)

  33. Townsend, Owocki & ud-Doula (in prep.)

  34. Summary • New approaches for modeling magnetic confinement in massive stars • MHD • RRM • RF-HD • Rewarding success in reproducing optical & X-ray properties

  35. Ongoing & Future Work • Confrontation between RF-HD and UV, X-ray (& interferometric) observations • Hybrid RF-HD/MHD models to simulate centrifugal breakout • Laboratories for understanding magnetic-radiation-rotation interaction • Synergies with other classes of magnetic object – Polar, AB Dor, Magnetar

  36. http://shayol.bartol.udel.edu/massivewiki/

  37. Sanz-Forcada et al. (2004)

  38. Centrifugal Breakout ZEUS - Density ud-Doula, Townsend & Owocki (2006)

  39. ZEUS - Temperature ud-Doula, Townsend & Owocki (2006)

More Related