SIMBAD references

Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spectra covering the 1.5-1.8 µm range for giant stars in the massive bulge globular clusters NGC 6440 and NGC 6441. We report the first high-dispersion abundance for NGC 6440, [Fe/H] = -0.56±0.02 and we find [Fe/H] = -0.50 ±0.02 for the blue Horizontal Branch cluster NGC 6441. We measure an average α-enhancement of ~ +0.3dex in both clusters, consistent with previous measurements of other metal rich bulge clusters, and favouring the scenario of a rapid-bulge formation and chemical enrichment. We also measure very low ¹²C/¹³C isotopic ratios (~5±1), suggesting that extra-mixing mechanisms are at work during evolution along the Red Giant Branch also in the high-metallicity regime. We also measure Al abundances, finding average [Al/Fe] = 0.45±0.02 and [Al/Fe] = 0.52±0.02 in NGC 6440 and 6441, respectively, and some Mg-Al anticorrelation in NGC 6441. We also measure radial velocities v_r= -76±3 and v_r= +14±3 km/s and velocity dispersions σ = 9±2 and σ = 10±2km/s in NGC 6440 and 6441, respectively.