Abundances of member stars of the Sextans dSph

We selected these stars using proper motions, radial velocities, and metallicities, and we confirm them as metal-poor members of Sextans with -3.34<=[Fe/H]<=-2.64 using high-resolution optical spectra collected with the Magellan Inamori Kyocera Echelle spectrograph.

Four of the five stars exhibit normal abundances of C (-0.34<=[C/Fe]<=+0.36), mild enhancement of the {alpha} elements Mg, Si, Ca, and Ti ([{alpha}/Fe]=+0.12+/-0.03), and unremarkable abundances of Na, Al, K, Sc, V, Cr, Mn, Co, Ni, and Zn. We identify three chemical signatures previously unknown among stars in Sextans. One star exhibits large overabundances ([X/Fe]>+1.2) of C, N, O, Na, Mg, Si, and K, and large deficiencies of heavy elements ([Sr/Fe]=-2.37+/-0.25, [Ba/Fe]=-1.45+/-0.20, [Eu/Fe]<+0.05), establishing it as a member of the class of carbon-enhanced metal-poor stars with no enhancement of neutron-capture elements.