Hansen, TereseHansen, C JChristlieb, NYong, DavidBessell, MichaelGarcia Perez, Ana EliaBeers, Timothy CPlacco, Vinicius MFrebel, AnnaNorris, JohnAsplund, Martin2015-12-130004-637Xhttp://hdl.handle.net/1885/70720We present an elemental abundance analysis for four newly discovered ultra metal-poor stars from the Hamburg/ESO survey, with [Fe/H] ≤ -4. Based on high-resolution, high signal-to-noise spectra, we derive abundances for 17 elements in the range from LiAuthor/s retain copyrightExploring the origin of lithium, carbon, strontium, and barium with four new ultra metal-poor stars201410.1088/0004-637X/787/2/1622015-12-11