Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..117..167l&link_type=abstract
Astronomy and Astrophysics Supplement, v.117, p.167-178
Astronomy and Astrophysics
Astrophysics
7
Instrumentation: Interferometers, Telescopes, Astrometry
Scientific paper
Space-based interferometers dedicated to wide-angle astrometry would dramatically increase the accuracy of angular measurements fundamental to a wide range of astrophysical problems. The proposed Global Astrometric Interferometer for Astrophysics (GAIA), a continuously rotating instrument comprising two or three interferometers, will reach the 5-20μas level on more than 35 million objects. The necessary wide field-of-view for such a precision could be obtained with a Fizeau interferometer. We designed and modelled a 2.6m baseline interferometer with two 40cm apertures, and overall dimensions compatible with the size of the Ariane V payload shroud. It has a ~1degree diffraction limited field-of-view. The response of the optical system to small perturbations on each optical element is given in terms of fringe visibility, which is shown to depend mainly on sub-aperture spot separation. The robustness of the design to thermal, mechanical and manufacturing errors is discussed.
Loiseau Sacha
Shaklan Stuart
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