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Splitting of the strongest absorption lines with a lower-level excitationpotential $\chi<$1eV has been detected for the first time in the opticalspectra of the post-AGB star V354Lac obtained with a spectral resolutionR=60000 at the 6-m telescope BTA. Analysis of the kinematics shows that theshort-wavelength component of the split line originates in the star's thickgas-dust envelope. Disregarding the splitting of strong lines when the chemicalcomposition is calculated leads to overestimated excess of s-process elements(Ba, La, Ce, Nd) in the stellar atmosphere. The profiles of strong absorptionlines have been found to be variable. The available radial-velocity datasuggest the absence of any trend in the velocity field in the atmosphere andcircumstellar envelope of V354Lac over 15 years of its observations.

Detection of heavy-metal lines in the spectrum of the circumstellar envelope of a post-AGB star