DETERMINING THE PROJECTION OF THE ROTATIONAL VELOCITY OF STARS BY THE SPECTRA OBTAINED AT THE SHAO ECHELLE SPECTROGRAPH

Abstract

In this study, methodological work has been developed and applied to determine the projection of the rotation velocity of stars from echelle spectra with a resolution of R = 28000, obtained at the Cassegrain focus of the 2 m ShAO telescope. To determine the instrumental contour, blend-free lines from the comparison spectrum of the calibration lamp were used. The instrumental
contour was obtained with a FWHM of lines as ∆λ = 0.15 ± 0.02 Å. Test measurements for 11 stars with different spectral types showed satisfactoryagreement with previously measured data except for the HAe star HD179218.A formula has been obtained for determining the projection of the rotation velocity for a given spectrograph, which allows one quite accurately to determine this parameter for different stars.