The EMCCD-based speckle interferometer of the BTA 6-m telescope: Description and first results
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The description is given for the speckle interferometer of the BTA 6-m telescope of the SAO RAS based on a new detector with an electron multiplication CCD. The main components of the instrument are microscope objectives, interference filters and atmospheric dispersion correction prisms. The PhotonMAX-512B CCD camera using a back-illuminated CCD97 allows up to 20 speckle images (with 512×512 pix resolution) per second storage on the hard drive. Due to high quantum efficiency (93% in the maximum at 550 nm), and high transmission of its optical elements, the new camera can be used for diffraction-limited (0.02″) image reconstruction of 15 m stars under good seeing conditions. The main advantages of the new system over the previous generation BTA speckle interferometer are examined.
PACS numbers95.55.Aq 95.55.Br 95.75.Kk
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