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THE CHEMICAL COMPOSITION OF HD 196944 : A CARBON AND S-PROCESS RICH, VERY METAL-POOR STAR

An LTE abundance analysis of the post-AGB candidate star HD 196944 is presented based on high resolution, high S/N spectra. The radial velocity of HD 196944 is found to be −174 km s−1 indicating that it belongs to the halo population. The spectroscopic analysis provides the atmospheric parameters Teff = 5250 K,log g = 1.7 (cgs),ξt = 1.9 km s−1 corresponding to those for G2-5 (bright) giants. A low iron abundance, [Fe/H] = −2.45, is derived confirming the old, low mass nature of the star. With [C/Fe] = +1.4 and a mean s-process overabundance of [s/Fe] = +1.1 the peculiar atmospheric composition of HD 196944 is confirmed. Possible evolutionary stages of HD 196944, that can explain its atmospheric parameters and composition, are discussed.