Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt........46m&link_type=abstract
PhD Thesis (in French) edited by the Université Joseph Fourier, Grenoble
Astronomy and Astrophysics
Astrophysics
1
Long-Baseline Interferometry, Amber, Vlti, Differential Phase
Scientific paper
Long baseline optical interferometry in astronomy is a technique allowing to get insights of an object with unprecedented angular resolution, impossible to reach with a single-dish telescope. This instrumentation domain is entering a new phase with the arrival of very large telescopes combined over baselines ranging up to 200m. AMBER (Astronomical Multi BEam Recombiner) is the three-telescopes recombining instrument of the european VLTI (Very Large Telescope Interferometer) bringing together spectral resolution and imaging capacity to this pioneering infrastructure in astrophysics. I present in this work my contribution to the digital signal processing of the AMBER instrument in order to extract the relevant measures from the data acquired. I present here the image space approach used and validated on sky with this instrument as well as the colour-differential observables that I developped specifically. The colour-differential observables compare the fringes measurement simultaneously recorded at two close-by wavelengths. This allows to reconstruct a very significant part of the phase of the object, usually lost in the currently-used observables in interferometry. I develop also the potential and practical application of these observables on the study of various astrophysical objects such as Balmer lines emitting stars and binary objects.
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