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The Galaxy as seen by RAVE

The Galaxy as seen by RAVE. L. Veltz, O. Bienaymé & A. Just. Outline. Model Observations Structure Kinematics Metallicity. Model Cigal. Our model. Equation of stellar statistics:. i => isothermal components. k => absolute magnitudes. self-consistent. Gravitational Potential.

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The Galaxy as seen by RAVE

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  1. The Galaxy as seen by RAVE L. Veltz, O. Bienaymé & A. Just

  2. Outline Model Observations Structure Kinematics Metallicity

  3. Model Cigal

  4. Our model Equation of stellar statistics: i => isothermal components k => absolute magnitudes

  5. self-consistent Gravitational Potential density distribution velocity dispersion Vertical gravitational potential:

  6. UCAC2 RAVE 2mass Complete within 5 to 15.4 magnitudes 3 to 7 mas.y-1 within 6 to 14 magnitudes Internal error of 2 km.s-1 Our samples • The analysis of the Galactic Disk structure relies on: • Star counts • Proper motions • Radial velocities

  7. Fit the observations Count Radial velocity Proper motions

  8. Kinematics distribution function Thin disk Thick disk

  9. Dwarf/Giant separation

  10. Color selection Absolute magnitudes: Clump giants MK=-1.61 Sub-giants MK=-0.89 MK=-0.17 Dwarfs MK=4.15 2mass-MSX-Hipparcos

  11. HR diagram

  12. Dwarf/Giant separation Subgiants Giants Dwarfs

  13. Selection of dwarfs

  14. Dwarf/Giant separation Dwarfs Giants Subgiants

  15. Dwarf/Giant separation Dwarfs Giants Subgiants

  16. Dwarf/Giant separation Giants Subgiants Dwarfs

  17. Photometric distance hyp.: all stars are Dwarfs

  18. Observations versus Model Thin/thick disk transition 45 Km/s 15-20 Km/s Thick disk Thin disk photometric distance (pc)

  19. Scaleheight

  20. Scale-height Thin disk Thin disk: hz=225 ± 10 pc Thick disk: hz=1048 ± 36 pc thick/ thin=8% Thick disk

  21. Scalelength

  22. hR=2500pc

  23. hR,1=1800pc & hR,2=2800pc

  24. Kinematics

  25. Selection of dwarfs

  26. Selection of dwarfs

  27. Selection of dwarfs

  28. Selection of dwarfs

  29. Dispersion-color

  30. Dispersion-color

  31. B-V <=> J-K

  32. Dispersion-color

  33. Dispersion - color

  34. Dispersion vs distance

  35. sigW-col (distance)

  36. Metallicity

  37. SDSS - RAVE

  38. Metallicity

  39. Metallicity-dispersion

  40. Conclusions

  41. Results • Kinematical decomposition • Clear separation between the thin and the the thick disk • Separation of dwarfs/giants • Determination Scale height /length • Kinematics function of Z • Metallicity • Space • kinematics

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