  Based on the high resolution spectral monitoring conducted at the 6-m BTA
telescope, we study the optical spectrum of the high-latitude variable V534
Lyr. Heliocentric radial velocities Vr corresponding to the positions of all
metal absorption components, as well as the NaI D and H$\alpha$ lines were
measured during all the observational dates. The analysis of the velocity field
examining the lines of various nature revealed a low-amplitude variability of
Vr based on the lines with a high excitation potential, which are formed in
deep layers of the stellar atmosphere, and allowed to estimate the systemic
velocity of Vsys$\approx-125$ km/s (V(lsr)$\approx-105$ km/s). The distance
estimate of d$\approx$6 kpc for the star leads us to its absolute magnitude of
Mv$\approx -5.3^{m}$, what corresponds to the MK spectral classification. The
previously undetected for this star spectral phenomenon was revealed: at
certain times a splitting of the profiles of low-excited absorptions is
observed, reaching $\Delta$Vr=20$\div$50 km/s. A combination of the parameters:
reduced metallicity [Met/H]$_{\odot}=-0.28$, increased nitrogen abundance
[N/Fe]=+1.10, large spatial velocity, high luminosity, a strong variability of
the emission-absorption profiles of HI lines, splitting of metal absorptions at
different observation moments and the variability of the velocity field in the
atmosphere allow us to consider V534 Lyr as a pulsating star in the instability
band near the HB and belonging to the thick disk of our Galaxy.
