Long-time spectral variability of IL Cep
We present results of our six-year study of the spectrum of IL Cep (HD 216629), a Herbig Be star. For the first time, we found that different spectral parameters of Нα and Нβ emission lines and absorption in the helium line HeI λ 5876 Å show slow variations at a time scale of 5–6 years; the spectral parameters reached their extremes in 2009–2010. Variations observed in the D1, D2 NaI, in a weak form follow the variation of radial velocities in Hα emission. The observed variability in the spectrum of the star is supposed to be associated with the presence of additional bodies in the system.
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