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Performance of the restoration of interferometric images from the Large Binocular Telescope - the effects of angular coverage and partial adaptive optics correction

M. Carbillet, S. Correia, P. Boccacci, and M. Bertero

Interferometry for Optical Astronomy II - Proc. SPIE Vol. 4838, 444-455 (2002)

This presentation reports the status of our study concerning the imaging properties of the Large Binocular Tele- scope (LBT) interferometer, and namely the effect of limited angular coverage and partial adaptive optics (AO) correction. The limitation in angular coverage, together with the correlated problem of angular smearing due to time-averaging of the interferometric images, is investigated for relevant cases depending on the declination of the observed object. Results are encouraging even in case of incomplete coverage. Partial AO-correction can result in a wide range of image quality, but can also create significative differences within a same field-of-view, especially between a suitable reference star to be used for post-observation multiple deconvolution and the observed object. Our study deals with both the problem of space-variance of the AO-corrected point-spread function, and that of global quality of the AO-correction. Uniformity, rather than global quality, is found to be the key-problem. After considering the single-conjugate AO case, we reach to some conclusions for the more interesting, and actually wide-field, case implying multi-conjugate AO. The whole study is performed on different types of object, from binary stars to diffuse objects, and a combined one with a high-dynamic range.

Download: HAWAII.pdf