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We present a study of the high-resolution optical spectrum for the hotpost-asymptotic giant branch (post-AGB) star, Hen 3-1013, identified as theoptical counterpart of the infrared sourceIRAS 14331-6435. For the first timethe detailed identifications of the observed absorption and emission featuresin the wavelength range 3700-9000 \AA\ is carried out. Absorption lines of HI,HeI, CI, NI, OI, NeI, CII, NII, OII, SiII, SII, ArII, FeII, MnII, CrII, TiII,CoII, NiII, SIII, FeIII and SIV were detected. From the absorption lines, wederived heliocentric radial velocities of $V_r=-29.6\pm0.4$ km/s. We haveidentified emission permitted lines of OI, NI, FeII, MgII, SiII and AlII. Theforbidden lines of [NI], [FeII], [CrII] and [NiII] have been identified also.Analysis of [NiII] lines in the gaseous shell gives an estimate for theelectron density $N_e\sim10^7$ cm$^{-3}$ and the expansion velocity of thenebula $V_{exp}=12$ km/s. The mean radial velocity as measured from emissionfeatures of the envelope is $V_r=-36.0\pm0.4$ km/s. The Balmer lines H$\alpha$,H$\beta$ and H$\gamma$ show P Cyg behaviour which indicate ongoing post-AGBmass-loss. Based on ASAS and ASAS-SN data, we have detected rapid photometricvariability in Hen 3-1013 with an amplitude up to 0.2 mag in the V band. Thestar's low-resolution spectrum underwent no significant changes from 1994 to2012. Based on archival data, we have traced the photometric history of thestar over more than 100 years. No significant changes in the star brightnesshave been found.

Line identification and photometric history of the hot post-AGB star Hen 3-1013 (IRAS 14331-6435)