Detailed chemical abundances of distant RR Lyrae stars in the Virgo
  Stellar Stream
  We present the first detailed chemical abundances for distant RR Lyrae stars
members of the Virgo Stellar Stream (VSS), derived from X-Shooter
medium-resolution spectra. Sixteen elements from carbon to barium have been
measured in six VSS RR Lyrae stars, sampling all main nucleosynthetic channels.
For the first time we will be able to compare in detail the chemical evolution
of the VSS progenitor with those of Local Group dwarf spheroidal galaxies (LG
dSph) as well as the one of the smooth halo.
