PROBABILITY IMAGING OF A FEW DOUBLE STARS FROM ONE-DIMENSIONAL NEAR-INFRARED SPECKLE DATA

Making use of the technique of probability imaging, intensity ratios a nd relative positions of components are obtained for six double stars (zeta Aqr, gamma Vir, zeta Ori , Gl 473, Gl 804 and Gl 866), from one- dimensional near-infrared speckle data obtained with a slit-scanning s peckle-graph. The two-fold probability density function (PDF) is used to reconstruct the binary system. The data reduction is made with a pa rametric approach, by minimizing a distance between observed two-fold PDFs and modelled ones, obtained by using a nearby reference star. In order to reduce the noise effects, weighting functions are applied to the PDFs prior to the distance measurements. Several distances have be en used (Euclidean, Kolmogorov, Jeffreys-Matusita, chi(2), Kullback-Le ibler) and have given consistent results.