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A high angular resolution (0.4") was reached at the BTA as a result of use of an image stabilizer, coupled with the optical image cutter and a specialized echelle spectra reduction algorithm during the observations with high spectral resolution (R=75000) in the wavelength range of 450-650 nm. This made it possible to study the properties and spatial distribution of the circumstellar matter in objects, located in our Galaxy at the distances of about 2 kpc.
A method for suppressing the background noise of radio sources was developed and implemented at the RATAN-600, allowing to increase severalfold the penetrating ability of the major Russian shortwave radio telescope.
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