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Globular Cluster Intrinsic Iron Abundance Spreads: I. Catalog

We present an up-to-date catalog of intrinsic iron abundance spreads in the 55 Milky Way globular clusters for which sufficiently precise spectroscopic measurements are available. Our method combines multiple datasets 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 random measurement error. The median intrinsic iron spread is found to be 0.045 dex, which is small but unambiguously measured to be non-zero in most cases. There is large variation between clusters, but more luminous globular clusters, above 10^5 L_sun, have increasingly large iron spreads on average; no trend between iron spread and metallicity is found.