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Optical spectra of the peculiar supergiant 3Pup taken in 1997-2008 are usedto analyze the spectral peculiarities and velocity field in its atmosphere. Theprofiles of strong FeII lines and of the lines of other iron-group ions have aspecific shape: the wings are raised by emissions, whereas the core issharpened by a depression. The latter feature becomes more pronounced with theincreasing line strength, and the increasing wavelength. Line profiles arevariable: the magnitude and sign of the absorption asymmetry, and theblue-to-red emission intensity ratios vary from one spectrum to another. Thetemporal Vr variations are minimal for the forbidden emissions and sharp shellcores of the absorption features of FeII(42), and other strong lines ofiron-group ions. The average velocity for the above lines can be adopted as thesystemic velocity: Vsys=28.5+/-0.5km/s. The weakest photospheric absorptionsand photospheric MgII, SiII absorptions exhibit well-defined day-to-dayvelocity variations of up to 7km/s. Quantitative spectral classification yieldsthe spectral type of A2.7+/-0.3 Ib. The equivalent widths and profiles ofHdelta and Hgamma, and the equivalent width of the OI7774A triplet yield anabsolute magnitude estimate of Mv=-5.5+/-0.3mag, implying the heliocentricdistance of 0.7kpc.

Spectral variability of the peculiar A-type supergiant 3Pup