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High resolution infrared spectra of NGC 6342 and NGC 6528: two moderately reddened Bulge Globular Clusters | | L. Origlia
; E. Valenti
; R.M. Rich
; | | Date: |
21 Oct 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 356 (2005) 1276-1282 | | Subject: | astro-ph | | Abstract: | Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spectra covering the range 1.5-1.8 micron for the moderately reddened bulge globular clusters NGC 6342 and NGC 6528, finding [Fe/H]= -0.60 and -0.17 dex, respectively. We measure an average alpha-enhancement of approx +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 (approx 5 in NGC 6342 and approx 8 in NGC 6528), suggesting that extra-mixing mechanisms due to cool bottom processing are at work during evolution along the Red Giant Branch. | | Source: | arXiv, astro-ph/0410519 | | Services: | Forum | Review | PDF | Favorites | |
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