  A new type of peculiarity -- a splitting or asymmetry of strong absorption
lines, is found in the optical spectra of selected post-AGB stars with C-rich
circumstellar envelopes. The effect is maximal in BaII lines whose profile is
split into two-three components. The particular components of the split
absorption lines are shown to be formed in a structured circumstellar envelope,
suggesting an efficient dredge-up of the heavy metals produced during the
preceding evolution of this star into the envelope. We suspect that the
splitting (or asymmetry) of the profiles of strongest absorptions with low
excitation potential of the low level can be associated with the kinematic and
chemical properties of the circumstellar environment and with type of its
morphology.

Solar and Stellar Astrophysics