Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ecgou..23..101m&link_type=abstract
Ecole de Goutelas #23, CNRS, 22-26 May 2000, edited by D. Egret, J.-L. Halbwachs, and J.-M. Hameury. Publisher: Societe Francai
Astronomy and Astrophysics
Astrophysics
Scientific paper
The ESA astrometry mission GAIA is expected to be flown in the early years of the next decade and to survey the whole sky down to the 20th magnitude with a nominal accuracy of 10 muas at 15 mag. The astrometry and astrophysics of multiple systems will benefit tremendously from the observations gathered by GAIA, but at the same time these objects complicate significantly the data processing. In this chapter the space astrometry of double and multiple systems is considered in the light of the hip results, which are summarized before the numerous and tricky questions more specific to GAIA are examined. GAIA will create an extraordinarily precise census of the double star population with orbital determination for about 10,000 systems, detection of millions of astrometric binaries and accurate measurement of masses of the components better than 1% for at least 10,000 pairs.
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