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Interférométrie différentielle avec AMBER

Abstract : 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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https://tel.archives-ouvertes.fr/tel-00134268
Contributor : Florentin Millour <>
Submitted on : Thursday, March 1, 2007 - 1:33:03 PM
Last modification on : Friday, November 6, 2020 - 4:04:32 AM
Long-term archiving on: : Wednesday, April 7, 2010 - 1:12:20 AM

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  • HAL Id : tel-00134268, version 1

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Florentin Millour. Interférométrie différentielle avec AMBER. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00134268⟩

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