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- W2004906184 abstract "We present measurements of the neutron-capture elements Rb and Pb in five giant stars of the globular cluster NGC 6752 and Pb measurements in four giants of the globular cluster M13. The abundances were derived by comparing synthetic spectra with high-resolution, high signal-to-noise ratio spectra obtained using HDS on the Subaru telescope and MIKE on the Magellan telescope. The program stars span the range of the O-Al abundance variation. In NGC 6752, the mean abundances are [Rb/Fe] = -0.17 ± 0.06 (σ = 0.14), [Rb/Zr] = -0.12 ± 0.06 (σ = 0.13), and [Pb/Fe] = -0.17 ± 0.04 (σ = 0.08). In M13 the mean abundance is [Pb/Fe] = -0.28 ± 0.03 (σ = 0.06). Within the measurement uncertainties, we find no evidence for star-to-star variation for either Rb or Pb within these clusters. None of the abundance ratios [Rb/Fe], [Rb/Zr], or [Pb/Fe] are correlated with the Al abundance. NGC 6752 may have slightly lower abundances of [Rb/Fe] and [Rb/Zr] compared to the small sample of field stars at the same metallicity. For M13 and NGC 6752 the Pb abundances are in accord with predictions from a Galactic chemical evolution model. If metal-poor intermediate-mass asymptotic giant branch stars did produce the globular cluster abundance anomalies, then such stars do not synthesize significant quantities of Rb or Pb. Alternatively, if such stars do synthesize large amounts of Rb or Pb, then they are not responsible for the abundance anomalies seen in globular clusters." @default.
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- W2004906184 date "2006-03-10" @default.
- W2004906184 modified "2023-09-27" @default.
- W2004906184 title "Rubidium and Lead Abundances in Giant Stars of the Globular Clusters M13 and NGC 6752" @default.
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- W2004906184 doi "https://doi.org/10.1086/499580" @default.
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