Identifying Moving Groups Using Elemental Abundances - A Study of KFR08

Abstract: In this work we study nine Hipparcos stars that has been identified as members of the KFR08 stellar stream by Bobylev et al. (2010). We perform high-resolution elemental abundance analysis on these stars using spectra from several sources (ELODIE, HIRES, MIKE and UVES) and the abundance analysis method from Bensby et al. (2003). Furthermore, we perform an angular momentum analysis of the stars using methodology from Kepley et al. (2007) and make an age estimation using Hipparcos photometry and Bertelli et al. (2009) isochrones. We find that five out of nine stars are members of a possible KFR08 moving group with metallicity [Fe/H]≃ −0.90 dex and an age of roughly 12 Gyrs. However, a small sample size makes the identifi- cation of a KFR08 moving group uncertain.