Spectroscopic Study of the High-latitude far Evolved Star V534 Lyr

Abstract

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$_{\rm eff}$ = 10500 K, surface gravity log g = 2.5, and microturbulent velocity ${\rm \xi_t}$=4.0 km/s. The underabundance of the iron group elements ${\rm [Met/H]_{\odot} = -0.50}$ 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.