We study a pulsating variable post-AGB star V534 Lyr = HD172324 based on five high resolution spectra ( R = 60 000 ) obtained with the NES echelle spectrograph of the 6–meter Russian telescope ( BTA ) in 2010 and 2013 .
Using the atmosphere modeling method and the Kurucz model set , we obtained the effective temperature T _ { eff } = 10500 K , surface gravity log g = 2.5 , and microturbulent velocity { \xi _ { t } } =4.0 km/s .
The underabundance of the iron group elements { [ Met / H ] _ { \odot } = -0.50 } was detected .
This fact in combination with high spatial velocity indicates that V534 Lyr does not belong to the disk population .
The radial velocity gradient in the V534 Lyr atmosphere is minimum : differential shifts of lines are close to measurement errors The spectral class A0 Iab corresponds to the distance to V534 Lyr , d \approx 6 kpc .