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High resolution infrared spectra of NGC 6342 and NGC 6528: two moderately reddened Bulge Globular

High resolution infrared spectra of NGC 6342 and NGC 6528: two moderately reddened Bulge Globular,L. Origlia,E. Valenti,R. M. Rich

High resolution infrared spectra of NGC 6342 and NGC 6528: two moderately reddened Bulge Globular  
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Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spec- tra covering the range 1.5 1.8 µm for the moderately reddened bulge globular clus- ters NGC 6342 and NGC 6528, finding (Fe/H)=-0.60 and -0.17 dex, respectively. We measure an average �-enhancement of � +0.33 dex in both clusters, consistent with previous measurements on other metal rich bulge clusters, and favoring the scenario of a rapid bulge formation and chemical enrichment. We also measure very low 12C/13C isotopic ratios (�5 in NGC 6342 and �8 in NGC 6528), suggesting that extra-mixing mechanisms due to cool bottom processing are at work during evolution along the Red Giant Branch.
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