We have developed in this paper a data processing method suitable for extracting astrometric information, absolute quadrant determination and relative photometry from speckle data of binary stars. The combination of classical visibility/autocorrelation calculus and our Q function is proposed for this purpose. The results obtained for three binary stars (with different order of magnitude differences and angular separations) are very promising, and we are currently applying it as a routine analysis procedure for our speckle observations. The method being quite simple and fast, it could rapidly lead to near real-time processing.
The authors wish to thank J.C.Dainty for providing the WHT's data of Per and for very helpful discussions about this paper; M.Carbillet thanks him more particularly for a five months stay in the Applied Optics group of Imperial College of London, under support of the European program Human Capital & Mobility (contract ERBCHRXCT 93 0335, coordinated by CEO Florence). Thanks are also due to J.-L.Prieur from Observatoire Midi-Pyrénées for the use of his specklegraph and his participation in the observations with the BLT. We are also indebted to B.Lopez and Y.Bresson for these observations, to H.Lantéri for stimulating and interesting discussions, and to C.Coulman for critical reading of the manuscript.