The preliminary results of the investigation of eclipsing binary star Beta Lyrae
The results of preliminary spectral investigations of enigmatic star b Lyr have been presented. Here we presented mainly the results of spectral investigations of spectral lines Ha and HeI 6678. The line Hα is double-peaked emission. This line consists of “broad” and “narrow” emission components and with the absorption feature that is always blue shifted. The radial velocity, equivalent widths, etc. of emission components of lines Hα and HeI 6678 have been determined and the character of the variability of these components was investigated. By measuring the radial velocities of lines SiII 6347 and MgII 4481 the radial velocity curve of the bright giant component (primary) was plotted. The orbital period of b Lyr changes because high mass loss rate of the bright giant component. The period increases by ~19 s per year.