High resolution infrared spectra of Bulge Globular Clusters : The extreme chemical abundances of Terzan 4 and Terzan 5

Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spectra covering the range 1.5 − 1.8 µm for the highly reddened bulge globular clusters Terzan 4 and Terzan 5. The clusters are of interest because a blue horizontal branch in Terzan 4 is consistent with very low metallicity, while Terzan 5 has been proposed as possibly the most… CONTINUE READING