Measurement of submilliarcsecond speckle displacements using a cross spectrum analysis technique - Test on atmospheric dispersion

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Atmospheric Attenuation, Differential Interferometry, Speckle Patterns, Spectrum Analysis, Atmospheric Turbulence, Binary Stars, Cross Correlation, Fast Fourier Transformations, Power Spectra, Telescopes

Scientific paper

This paper presents a cross-spectrum analysis technique, which makes it possible to measure submilliarcsecond shifts between two speckle patterns at two close wavelengths, and, then, to check the feasibility of the 'differential speckle interferometry' techniques proposed by Beckers. The measuring of micro-displacements as small as 1 milli arc s, produced by the atmospheric dispersion, is described and the results are presented and discussed in the cross-correlation space as well as the cross-spectrum space. Further astronomical applications of this technique in the field of high angular resolution are also considered.

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