Gaia-SAM Document - Outline

Created: UH, AK 2008-04-08
Revisions: see svn log

Title: Towards realistic stellar atmosphere models:
       application to Gaia data processing

first draft complete: end of June 2009

1) Introduction ... UH

   introduction.tex
   
   Background on Gaia, DPAC and astrophysical parametrization of Gaia sources
   (see "Background" section on GaiaSAM web page)

2) Aims and motivation ... AK+FT   -  end of April

   aims.tex

   Calibration of the astrophysical parametrization of Gaia sources.

   Improving the models to the extent needed to allow Gaia to achieve its
   science goals, based on basic parameters (Teff, logg, abundances)
   - e.g.  separation of populations by chemical composition.

3) Methods and current status   -   end of May

   Observations ... UH
   status_observations.tex
   - public archives (list on Gaia Wiki)
   - new high-res spectra (candidate benchmark stars)
   - radii from interferometry (new and literature)
     (input from FT, PK needed)
   - fundamental parameters (Teff,logg) for cand. benchmark stars
     (values, references, methods, accuracies)

   Modelling ... LB+RC
   status_modelling.tex
   - 3D atmosphere models (Nordlund & Stein)
     > snap shots of a number of stars with "old code"
     > new code installed, being tested
   - model atoms: Ca for DETAIL, Ca for MULTI under development
                  old one for Mg
                  (input from FT, AK)
   - H-collision cross-sections: Mg-H (input from PB, NF)


4) Long-term plans (4 years)   -   end of June

   Observations ... UH
   plans_observations.tex
   - regular updates of archive list
   - reduction and 1D analysis of high-res spectra
   - 3D analysis of high-res spectra
   - 1D/non-LTE, 3D/non-LTE analysis
   - reduction and analysis of interferometric data (FT, KP)
   - new observations (photometry, spectrophotometry, polarimetry FT)

   Modelling ... LB, RC, FT, AK, NF
   plans_modelling.tex
   - 3D code: complete transition to and tests of "new code" (LB, RC)
   - snapshots for benchmark stars for 3D analysis (LB, RC)
   - Ca atom in DETAIL (AK) vs. in MULTI-1D (FT),
     benchmarking with observations
   - Mg MULTI-1D with new H-collision data (FT, NF, AK)
   - implementation of NLTE Ca triplet in MARCS grid (current atom + improved
     atom with new H-collision data later) (AK)
   - MULTI-3D (FT, RC)


5) Short-term schedule (2009)

   schedule.tex

   Available manpower (in FTE):

   PB 0.4, NF 0.2 (PhD?, MG 0.2, AS 0.2)    ~1.0
   LB 0.75, RC 0.35                         ~1.0
   UH 0.75 (AÖ 0.3)                         ~1.0
   AK 0.6 (VM 0.6, BE 0.3)                  ~1.5
   FT 0.2 (TM 0.9, MB 0.1?, PK 0.15)        ~1.5

   Required manpower (in FTE): ...

   Schedule: ...
   

6) Concluding remarks

   conclusions.tex

   ...