1. 20/04/02 - F.A.DMS/PS organisation 1 Proposal for tasks and schedule -Coordination is needed -Tasks -Tools -Topics -Which areas are not covered -Manpower versus needs -Complementary observations -Tools and methods -End to end simulation -Prototype of reduction

2. 20/04/02 - F.A.DMS/PS organisation 2 Questions (I) Selection function –Should we go fainter in magnitude (larger mass ratios) –In MBP/Spectro and in astro –Which choice in dense areas How to organise the future DMS data processing –Rejection from core processing –Various categories of DMS –Concurrential methods

3. 20/04/02 - F.A.DMS/PS organisation 3 Questions (II) Impact of binarity on spectro design –Resolution and SB2 (simulation with correct instrumental effects - in progress) –Someone from the RVS group could come into the DMS group? Impact of binarity on MBP design –Interacting binaries –Classification of unresolved binaries –Need of interface with the photometric group?

4. 20/04/02 - F.A.DMS/PS organisation 4 Overall mission schedule 200420122016202020082000 Acceptance Techno. development Build, Test Launch Observations Analysis Catalogue

5. 20/04/02 - F.A.DMS/PS organisation 5 Prio 1A: the satellite design On-board detection –Detection algorithm Arenou/Babusiaux -> SEPT 02 –Detection limits for multiple objects Sample and patch study –Optimise sampling windows and observing Söderhjelm –strategy(at different magnitudes) Söderhjelm MBP/Spectro simulations –Spatial resolution problems (large pixels!) –Binarity effects for the filter selections –Spectral resolution for efficient SB detection Random & systematics for bright stars –gain (Short term: - september 2002, PDHE study) Long term:- early 2005, design frozen (much before, because of testing)

6. 20/04/02 - F.A.DMS/PS organisation 6 Prio 1B: multiple stars in simulations and reductions Galaxy model –Binaries/multiples in simulations Prototype single-star reduction –Rejection of multiples –Database principles (multiple star/individual component boundaries)

7. 20/04/02 - F.A.DMS/PS organisation 7 Prio 2A: assessing the scientific capabilities Simplified reduction simulations –Semi-realistic astrometric errorsS. Söderhjelm –BBP Photometric errors –Resolution limits –Curved proper motion detection limits –SB detection limits –Eclipsing binaries detection limits Galaxy modelling with multiple stars –Expected numbers and accuracies for multiple star observations with GAIA –Evolutionnary models

8. 20/04/02 - F.A.DMS/PS organisation 8 Prio 2B: dedicated DMS reduction algorithms Reduction simulation with no a priori knowledge –Resolved doubles Reduction simulation with period-finding –Resolved binary orbits –Astrometric binaries orbitsD. Pourbaix –SB orbits –Extrasolar planet orbits –Eclipsing binaries/transitsN. Robichon Reduction simulations for multiple stars –Resolved multiples –Astrometric binaries in resolved binaries –Eclipsing Binaries in resolved binaries –(+arbitarily long list of special cases...)

9. 20/04/02 - F.A.DMS/PS organisation 9 Prio 3: Science Case Uniqueness (or not) of the GAIA results –Stellar masses –Binary statistics –Binary origin and evolution – …

10. 20/04/02 - F.A.DMS/PS organisation 10 Organisation Put names on task responsibilities Reference document (short term) Publication plan –technical –Scientific: increase Gaia visibility Next meeting –Parallel meeting in Monte-Rosa? –13-14 Sept

11. 20/04/02 - F.A.DMS/PS organisation 11 Actions Activate PS web page –F.A. Give simulated data for orbit determination –First agree on protocol –F.A./C.B. Blind tests for orbits –Dimitri –Alessandro –Hans-H What people can give, what they request for simulations –All –Mario+Dimitri to agree on protocol and to contact Carine for simulations –ML: circulate a page

12. 20/04/02 - F.A.DMS/PS organisation 12 Thanks To Annick Oger and Pascal Hammes for the logistics To Staffan for the scientific organisation To your contribution (to be sent by email…)