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- W3099190669 endingPage "155" @default.
- W3099190669 startingPage "155" @default.
- W3099190669 abstract "NGC 6229 is a relatively massive outer halo globular cluster that is primarily known for exhibiting a peculiar bimodal horizontal branch morphology. Given the paucity of spectroscopic data on this cluster, we present a detailed chemical composition analysis of 11 red giant branch members based on high resolution (R ≈ 38,000), high S/N (>100) spectra obtained with the MMT-Hectochelle instrument. We find the cluster to have a mean heliocentric radial velocity of , a small dispersion of , and a relatively low . The cluster is moderately metal-poor with dex and a modest dispersion of 0.06 dex. However, 18% (2/11) of the stars in our sample have strongly enhanced [La, Nd/Fe] ratios that are correlated with a small (∼0.05 dex) increase in [Fe/H]. NGC 6229 shares several chemical signatures with M75, NGC 1851, and the intermediate metallicity populations of ω Cen, which lead us to conclude that NGC 6229 is a lower mass iron-complex cluster. The light elements exhibit the classical (anti-)correlations that extend up to Si, but the cluster possesses a large gap in the O–Na plane that separates first and second generation stars. NGC 6229 also has unusually low [Na, Al/Fe] abundances that are consistent with an accretion origin. A comparison with M54 and other Sagittarius clusters suggests that NGC 6229 could also be the remnant core of a former dwarf spheroidal galaxy." @default.
- W3099190669 created "2020-11-23" @default.
- W3099190669 creator A5007011233 @default.
- W3099190669 creator A5024199589 @default.
- W3099190669 creator A5028301941 @default.
- W3099190669 creator A5082738705 @default.
- W3099190669 date "2017-09-19" @default.
- W3099190669 modified "2023-10-18" @default.
- W3099190669 title "Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229" @default.
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