Abstract
This article is the fourth paper from cycle of notices, which devoted to the creation of spectrophotometric standards of intermediate brightness. The stars-standards such as brightness are necessary first of all for standardization of the spectral observations on the big telescopes. In paper the absolute energy distribution in visual region of spectra for 6 B-A-stars about 8m were present. The investigated stars are located along the sky parallel with δ = +61˚ in the range of right ascensions from 0h to 24h . Observations were carried out on the telescope Zeiss-600 (D : F = 1 : 12) with the help of a diffraction spectrograph with toroidal grating. The receiver of radiation was served by CCD-camera ATIC 490EX. Equipment, observation methods, reductions and computations detailed described in our first paper of present cycle. The distribution of energy was studied in the range of 345nm - 665nm; the spectral resolution of the data is 5nm, the relative standard error of the received data - from 2 to 6%. The reliability of the obtained monochromatic results is assessed by means of comparing the calculated and directly observed star magnitudes in the UBV-system.
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