The extremely low-metallicity tail of the Sculptor dwarf spheroidal galaxy

We present abundances for seven stars in the (extremely) low-metallicity tail of the Sculptor dwarf spheroidal galaxy, from spectra taken with X-shooter on the ESO VLT. Targets were selected from the Ca II triplet (CaT) survey of the dwarf abundances and radial velocities team (DART) using the latest calibration. Of the seven extremely metal-poor candidates, five stars are confirmed to be extremely metal-poor (i.e., [Fe/H] < -3 dex), with [Fe/H] = -3.47 +/- 0.07 for our most metal-poor star. All have [Fe/H]