Issue EAS Publications Series Volume 8, 2003 Astronomy with High Contrast Imaging Page(s) 245 - 257 DOI 10.1051/eas:2003068

Astronomy with High Contrast Imaging
C. Aime and R. Soummer (eds)
EAS Publications Series, Vol. 8, 2003
DOI: 10.1051/eas:2003068

Adapted scale image subtraction for achromatic coronography

J. Gay¹, J.-P. Rivet² and Y. Rabbia<sup>1

1</sup>  Dept. Fresnel, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France
²  Dept. Cassini, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France

Abstract
The detection of a faint companion to a star with achromatic coronography and adaptative optics is only limited by the residual speckles. We study a method to increase the detectability of the companion, based on the difference of two images taken in two different wavelengths, after suitable rescaling.

© EAS, EDP Sciences 2003

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