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- W3106462043 abstract "Using the NIRSPEC spectrograph at Keck II, we have obtained echelle spectra covering the range 1.5–1.8 μm for two of the brightest giants in Liller 1 and NGC 6553, old metal-rich globular clusters in the Galactic bulge. We use spectrum synthesis for the abundance analysis and find [Fe/H] = -0.3 ± 0.2 and [O/H] = 0.3 ± 0.1 (from the OH lines) for the giants in both clusters. We measure strong lines for the α-elements Mg, Ca, and Si, but the lower sensitivity of these lines to abundance permits us only to state a general [α/Fe] = 0.3 ± 0.2 dex. The composition of the clusters is similar to that of field stars in the bulge and is consistent with a scenario in which the clusters formed early, with rapid enrichment. We have difficulty achieving a good fit to the spectrum of NGC 6553 using either the low or the high values recently reported in the literature, unless unusually large or no α-element enhancements are adopted, respectively." @default.
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- W3106462043 date "2002-03-01" @default.
- W3106462043 modified "2023-10-18" @default.
- W3106462043 title "High-Resolution Infrared Spectra of Bulge Globular Clusters: Liller 1 and NGC 6553" @default.
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- W3106462043 doi "https://doi.org/10.1086/338897" @default.
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