Photon bias compensation in triple correlation imaging and observation of R 136
Pehlemann, E., Hofmann, K.-H., Weigelt, G.
Astronomy & Astrophysics, 256, pp.701-714 (1992)
We report diffraction-limited speckle masking observations of the central object R 136 in the 30 Doradus Nebula, and we describe a new method for the compensation of the 4-dimensional photon bias terms in the average bispectrum. More than 40 stellar components are present in the 4.9 x 4.9 arcsec field of view of our reconstructed images. The closest binaries found have separations between 0.03 and 0.05 arcsec. Because of the large number of photon events in our speckle interferograms, it was not possible to apply photon counting techniques. Therefore, the extended photon events caused various frequency-dependent bias terms in the average image bispectrum. To overcome this influence of photon noise, we have developed a new technique for the compensation of the 4-dimensional photon bias terms in the bispectrum. We describe the theory of the method and demonstrate its feasibility by various image reconstruction experiments.
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