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- W2988196502 abstract "We present an up-to-date catalog of intrinsic iron abundance spreads in the 55 Milky Way globular clusters (GCs) for which sufficiently precise spectroscopic measurements are available. Our method combines multiple data sets when possible to improve the statistics, taking into account the fact that different methods and instruments can lead to systematically offset metallicities. Only high spectral resolution (R > 14,000) studies that measure the equivalent widths of individual iron lines are found to have uncertainties on the metallicities of the individual stars that can be calibrated sufficiently well for the intrinsic dispersion to be separated cleanly from a random measurement error. The median intrinsic iron spread is found to be 0.045 dex, which is small but unambiguously measured to be nonzero in most cases. There is large variation between clusters, but more luminous GCs, above 105 L⊙, have increasingly large iron spreads on average; no trend between the iron spread and metallicity is found." @default.
- W2988196502 created "2019-11-22" @default.
- W2988196502 creator A5068512397 @default.
- W2988196502 date "2019-10-30" @default.
- W2988196502 modified "2023-10-11" @default.
- W2988196502 title "Globular Cluster Intrinsic Iron Abundance Spreads. I. Catalog" @default.
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- W2988196502 doi "https://doi.org/10.3847/1538-4365/ab4812" @default.
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