Gaia-SAM paper

alfa Cen A&B

Nice, 2008-05-15
Uppsala, 2009-03-13

Title: ...
 - start with alf Cen A, if possible include alf Cen B

Outline:

I Intro -> Lionel
  present status, stars, motivation (-> asteroseismology), SAM group

II Observations and input data
   a) observations used -> Ulrike
   b) input atomic data, log gf -> Lionel

III Analysis
    a) 3D approach (Lionel), incl. test of resolution (150^3 vs. 250^3)
    b) 1D analysis (Ulrike)
    both a and b differential to solar models
    c) 1D-non-LTE analysis for selected lines (Andreas)
    including ionization and excitation equilibria,
    Mg b lines, ...
    d) Balmer lines in 1D (Paul)
    (Balmer lines in 3D -> postponed after discussion with Martin A.)
    e) Comparison

IV Stellar paramenters -> Frédéric
   Teff, masses from
   a) Evolutionary tracks
   b) age, ...
   c) Asteroseismic predictions

V Conclusions

Notes:

* line selection:
  Mg, Ca, FeII lines -> Andreas
  Ti I+II -> Ulrike

* solar spectrum with HARPS