5th DMS/PS meeting October 8

Welcome!

08-10-04 DMS - Paris meeting 5

Meeting agenda Halbwachs J-L. Astro. binaries with a variable

component Pourbaix D. Colour-induced binaries Pourbaix/Jancart Spectro binaries code Söderhjelm S. Simulations using a single-star

galaxy Other possible talks or comments on posters:

Dischler J. (Eclipsing binaries),

Arenou F. (performances with GDAAS ASM data handling),

Nurmi P., (on-going work: simulations, imaging)

…

Discussion  Simulation tasks: how to implement them in the "Gaia Object Generator", how to

introduce multiple, variables for DMS?

DMS work packages: status of the various algorithms, what is missing, what priorities? How to optimize them? How to combine their results?

Test campaign: how to implement an end-to-end test (from the various, and varying, on-board strategy features to the various final parameters), under which schedule?

08-10-04 DMS - Paris meeting 5

Symposium presentations/posters

Presentations/posters at the symposium Census of binaries - the big picture, S. Söderhjelm

Stellar wobble in triple systems mimicking a planet, J. Schneider

Automatic parametrisation of Gaia spectroscopic binary stars, T. A. Kaempf et al.

Observing faint binaries with GAIA, P. Nurmi

Galaxy simulations of binary stars, P. Nurmi & H. Boffin

Identification of Spectroscopic Binaries by Medium Band Photometry, Willemsen et al.

Duplicity and masses, D. Pourbaix

Data reduction for double and multiple stars, F. Arenou & S. Söderhjelm

Predicted properties of eclipsing binaries observable with Gaia, J. Dischler & S. Söderhjelm

Astrometric binaries with a variable component, J-L. Halbwachs & D. Pourbaix

Orbit determination for Gaia spectroscopic binaries, S. Jancart & D. Pourbaix

Hipparcos astrometric binaries in SB9, S. Jancart et al.

Fundamental stellar parameters from double-lined eclipsing binaries, P.M. Marrese et al.

The physical parameters of close E.B. derived from Gaia photometry, P.G. Niarchos et al.

New numerical minimization algorithms for analysis of eclipsing binary stars, Prsa & Zwitter

08-10-04 DMS - Paris meeting 5

Since Brussels meeting Pasi Nurmi one week in Meudon

Discussion with M. Haywood about galaxy model with BSE code

Simulations Inclusion of DMS in single star simulated Galaxy, by S. Söderhjelm,

DMS-SS-05

Orbits A better spectroscopic orbit (short periods) algorithm (D. Pourbaix)

Training student on “photocentric” binaries (C.I.D.) 106 with photocenter displacement between 2 bands > 1 105 detections with 1/1000 false detections?

Identification and parametrisation of binaries in MBP Willemsen, Kaempf, Bailer-Jones, ICAP-PW-003

CPU estimation : Staffan Söderhjelm, Pasi Nurmi, Andrej Prsa, Claire Dollet, Dimitri

Pourbaix

08-10-04 DMS - Paris meeting 5

Last DMS meeting goals

A short term plan Realistic simulation software:

Beginning of test campaign: September 2004

Reports on DMS algorithms capabilities and improved science case: end 2004

Reappraisal of the algorithms definition: early 2005

08-10-04 DMS - Paris meeting 5

08-10-04 DMS - Paris meeting 5

08-10-04 DMS - Paris meeting 5

Core + Associate members Frédéric Arenou

Carine Babusiaux

Coryn Bailer-Jones

Henri Boffin

Johann Dischler

Claus Fabricius

Paul Groot

Jean-Louis Halbwachs

Sylvie Jancart

Patricia Lampens

Oleg Malkov

Francois Mignard

Pasi Nurmi

Dimitri Pourbaix

Noël Robichon

Dimitris Sinachopoulos

Staffan Söderhjelm

Hans-Heinrich Bernstein

Melvin Davies

Claire Dollet

Misha Haywood

Erik Hoeg

Carme Jordi

Roberto Morbidelli

Panagiotis Niarchos

Edouard Oblak

Julienne Palasi

Renato Pannunzio

Ignasi Ribas

Alessandro Spagna

Toma Tomov

Christopher Tout

Vladas Vansevicius

Hans Zinnecker

08-10-04 DMS - Paris meeting 5

Organisation

Membership: 17 core+ 17 associates

In effect: much less FTE? 3-4?

New (after Gaia 2004): A. Prsa, P. Willemsen,

Funding: Opportunity in Meudon to work on an end-to-end test (on-board

design => dense regions) one year (funding to be finalised)

Greece

Encouragement for others…

08-10-04 DMS - Paris meeting 5

08-10-04 DMS - Paris meeting 5

08-10-04 DMS - Paris meeting 5

Actions C.I.D./photocentric binaries

F.Arenou+D.Pourbaix to give the statistical tests which have been used for the C.I.D

Staffan (+ideas from Lennart) to compute the number of objects and place in m/P

V.I.M (variable component) JLH: using BBP can give color information on components

JLH: try to get actual numbers + improvement of algorithm

JLH: technical note (input from Dimitri)

Algorithms Dimitri: is interested by astro+RV in multiples (after tackling doubles)

Simulations Annie Robin/Staffan/Pasi: Exchange of data and comparison tests done before

the next meeting

Next meeting: 14 April, Geneva (to confirm) After the PS meeting