Beryllium Abundances in Li-rich Red Giants

We present measurements of beryllium abundances in a sample of Li-rich red giant stars selected to discriminate between Li replenishment scenarios. One subset of the red giants have characteristics consistent with Li synthesis and extra-mixing (e.g., very low 12C/13C), while the other subset has characteristics more suggestive of planet engulfment (e.g., enhanced rotation or "normal" 12C/13C ratios). These two Li-replenishment scenarios should result in either very low or enhanced Be abundances, respectively. We find that the two subgroups of stars do show differences in their Be abundances, but we do not find Be enhancements as large as predicted. We compare our results to a large sample of Be measurements in Li normal red giants in an effort to better interpret these findings