Stellar distances

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Stellar distances

• Stellar distances with a galactic model
• limitation model dependent !
• limitations (8 april 2006) N.S. G.P.,
  J-K0.5-0.7
• At a given apparent magnitude m_k (and/or p.m.,
  Vrad)
• probability for a star to be a giant or a dwarf
  (with a given absolute magnitude)
• Radial velocities with Elodie at OHP

Dwarfs
Giants
2
Stellar distances
Giants

• Stellar distances with a galactic model
• At given p.m., Vrad
• probability for a star to be a giant or a dwarf
  (with a given absolute magnitude)

Dwarfs
3
Stellar distances
Giants

• Stellar distances with a galactic model
• At given p.m., Vrad
• probability for a star to be a giant or a dwarf
  (with a given absolute magnitude)

Dwarfs
1.
Probability(giant)
Rave J-K0.5-0.7 SGP
0.
K mag
4
Stellar distances
Giants

• Stellar distances with a galactic model
• At given p.m., Vrad
• probability for a star to be a giant or a dwarf
  (with a given absolute magnitude)

Dwarfs
Number of giants And dwarfs At SGP In Rave
(sept.05)
5
Next steps ?

• A probabilistic catalogue of distances for Rave
• Is -it useful ?
• How to use it ?
• Draw the distances according to a PDF
• Never twice the same catalogue

6
Next steps ?

• A probabilistic catalogue of distances for Rave
• Is -it useful ?
• How to use it ?
• Draw the distances according to a PDF
• Never twice the same catalogue
• Do not take the most probable distance --gt bias
• All sky and JK.5-0.7 october 2006
• All sky . End of 2007 ??

7
Next steps ?

• A probabilistic catalogue of distances for Rave
• Is -it useful ?
• How to use it ?
• Draw the distances according to a PDF
• Never twice the same catalogue
• Do not take the most probable distance --gt bias
• All sky and JK.5-0.7 october 2006
• All sky . End of 2007 ??
• Rachel---gt reduced proper motions
• gt not model dependent !!!! (streams)

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