Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 245, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4365/ab4812
Keywords
Globular star clusters; Stellar abundances; Astrostatistics strategies; Catalogs
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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 0.045dex, which is small but unambiguously measured to be nonzero in most cases. There is large variation between clusters, but more luminous GCs, above 10(5) L, have increasingly large iron spreads on average; no trend between the iron spread and metallicity is found.
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