Homogeneity in the early chemical evolution of the Sextans dwarf
  Spheroidal galaxy
  We present the high-resolution spectroscopic analysis of two new extremely
metal-poor stars (EMPS) candidates in the dwarf spheroidal galaxy Sextans.
These targets were pre-selected from medium resolution spectra centered around
the Ca II triplet in the near-infrared and followed-up at higher resolution
with VLT/UVES. We confirm their low metallicities with [Fe/H]=-2.95 and
[Fe/H]=-3.01, placing them among the most metal-poor stars known in Sextans.
The abundances of 18 elements, including C, Na, the alpha-elements, Fe-peak,
and neutron capture elements, are determined. In particular, we present the
first measurements of Zn in a classical dwarf at extremely low metallicity.
There has been previous hints of a large scatter in the abundance ratios of the
Sextans stellar population around [Fe/H] -3 when compared to other galaxies. We
took the opportunity of this work to re-analyse the full sample of EMPS and
find a Milky-Way -like plateau and a normal dispersion at fixed metallicity.
