Feh-Duf: very high-velocity low-metallicity star with peculiar chemical abundance

We present the results of a study of the very high velocity (vrad = +448.0 ± 1.0 km s_1) low-metallicity ([Fe/H]= -1.93) star Feh-Duf (Fehrenbach & Duflot 1981) showing peculiar chemical abundance. Using high-resolution spectrum, we showed that this star has enhanced carbon and heavy s-process element abundance ([C/Fe] =+0.58, [hs/Fe] =+0.88 dex) while the [Y/Fe] = -0.07 dex). The carbon isotopic ratio is low (12C/13C= 8). We found that oxygen abundance is reduced ([O/Fe]= +0.10 dex) as compared with Galactic field stars of a similar metallicity. The evolution state of this star and its possible extragalactic origin are discussed.