SPECTROPHOTOMETRIC STANDARDS 8m-10m. Ш. THE EQUATORIAL ZONA FROM 12h TO 24h

Аннотация

This article is the third paper from cycle of notices, which devoted of the creation of
spectrophotometric standards of in-termediate brightness. In paper the absolute energy distribution in visual region of
spectra for 12 B-A-stars 8m-10m were present. The investigated stars-standards are located along the celestial equator in the range of right ascensions from 0h to 12h. Together with the stars from the second work of this cycle,
they form a system of equatorial standards of intermediate brilliance. As a product of these two works, the total
number of spectrophotometric standards of 8m-10m in the visible spectrum area has more than doubled.
Equipment, observation methods, reductions and computations detailed described in our first and second papers.
The distribution of energy was studied in the range of 340nm - 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 results is assessed by comparing the
calculated and directly observed star magnitudes of the investigated stars in the UBV-system. For several stars, the
distribution of energy in their spectrums, in addition to the observations, was calculated by photometric data.
Differences between them in the ultraviolet region can reach 20-30% due to differences in the course of energy
distribution curves in their spectrums, errors in spectral classification and determination of interstellar absorption.