  High-resolution spectra of the LBV candidate Schulte 12 in the Cyg OB2
association were obtained at the 6-meter BTA telescope with the NES echelle
spectrograph on the arbitrary dates in 2001-2022. Variability of the emission
profile of H$\alpha$ and absorptions of HeI, SiII with time was found. Based on
the radial velocity measurements at 10 observation dates, radial velocity
variability with an amplitude of $\Delta$Vr$\approx$8 km/s relative to the
average value of the heliocentric velocity Vr=$-15.6\pm2.6$ km/s was revealed.
This indicates the presence of a companion in the system. Based on the reliable
intensity measurements of a sample of DIBs, color excess
E(B-V)=1.74$\pm0.03^{m}$ was determined. This results in the interstellar
extinction value Av$\approx 5.6^m$ that is only about half of the total
extinction. Taking current Schulte 12 parameters, including Gaia~EDR3 parallax,
we estimated its absolute magnitude as Mv$\approx -9.2^m$ and luminosity
log$(L/L_{\odot})\approx$5.5, which does not exceed the Humphreys-Davidson
limit.
