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Berkeley-Illinois-Maryland Assoc. (BIMA) Array CO J=1-0 Survey

Berkeley-Illinois-Maryland Assoc. (BIMA) Array CO J=1-0 Survey. M. Meixner (STScI). Background/motivation Observations Models Summary. Collaborators: Fong, Justtanont,Sutton, Welch, Zalucha. Conclusions.

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Berkeley-Illinois-Maryland Assoc. (BIMA) Array CO J=1-0 Survey

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  1. Berkeley-Illinois-Maryland Assoc. (BIMA) Array CO J=1-0 Survey M. Meixner (STScI) Background/motivation Observations Models Summary Collaborators: Fong, Justtanont,Sutton, Welch, Zalucha

  2. Conclusions • Observed features: expanding shells, protrusions, collimated outflows, rotation • Kinematic trichotomy: -simple expansion with protrusions found in elliptical (SOLE) PPN -expansion + collimated outflows found in bipolar (DUPLEX) PPN -expansion + rotation (new class) • Mass loss histories

  3. Motivations for CO J=1-0 • Best tracer of molecular gas mass • AGB mass loss is predominantly molecular • Kinematics in proto-planetary nebulae (0.5 km/s) • Toughest molecule w.r.t. photodissociation => probes outer regions CO

  4. Vexp V0 Vexp Vexp Vexp V0-Vexp V0 Jy V0+Vexp V0+Vexp V0-Vexp V0

  5. Observations • Millimeter interferometry with the BIMA array • Combined with single dish maps from the NRAO 12 m • Full synthesis maps provide • Spectral resolution 1 km/s, coverage 128 km/s • 0.5" to 200" scale sizes

  6. Three kinematic signatures • Simple expansion: IRC+10216 (Fong), IRAS 22272+5435, HD179821, HD 161796, HD 56126, IRAS 21282+5050 • Expansion + collimated outflows: AFGL 2688, NGC 7027, AFGL 618 • Expansion + rotation: Mira, 89 Her, Red Rectangle (Doering)

  7. IRAS 22272+5435

  8. IRAS 22272+5435

  9. IRAS 22272+5435

  10. HD 179821

  11. HD 179821

  12. HD 179821

  13. HD 161796

  14. HD 161796

  15. HD 161796

  16. Simple expansion:PPN show protrusions but no outflows to create them.How did they form?

  17. Egg Nebula / AFGL 2688

  18. Egg Nebula / AFGL 2688

  19. Egg Nebula / AFGL 2688

  20. Egg Nebula / AFGL 2688

  21. NGC 7027

  22. NGC 7027

  23. NGC 7027

  24. NGC 7027

  25. Expansion + collimated outflows • Velocity of collimated outflow is faster than the expansion velocity of the envelope (AFGL 2688 and NGC 7027) • Collimated outflows or bullets?

  26. Mira

  27. Mira

  28. 89 Her

  29. 89 Her

  30. Expansion + rotation • Rotation? Or low velocity bipolar outflow? • Expansion velocity of the envelope is greater than the rotation/bipolar velocity (Mira, 89 Her) • In either case, they are kinematically distinct from expansion + collimated outflow

  31. HD 56126

  32. HD 56126

  33. HD 56126: Models & Observ.

  34. Conclusions • Observed features: expanding shells, protrusions, collimated outflows, rotation • Kinematic trichotomy: -simple expansion with protrusions found in elliptical (SOLE) PPN -expansion + collimated outflows found in bipolar (DUPLEX) PPN -expansion + rotation (new class) • Mass loss histories

  35. V0 -Vexp Vexp V0-Vexp Jy V0 V0+Vexp V0+Vexp V0-Vexp V0

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