Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud IV: Evidence for Multiple Populations in Hodge 11 and NGC 2210

Abstract

We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular Clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO-14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second population representing ($20\pm \sim 5$)% for NGC 2210 and ($30\pm \sim 5$)% for Hodge 11. In both clusters, the smaller population is redder than the primary population, suggesting CNO variations. Hodge 11 also displays a bluer second population in the horizontal branch, which is evidence for helium enhancement. However, even though NGC 2210 shows similarities to Hodge 11 in the main sequence, there does not appear to be a second population on NGC 2210's horizontal branch. This is the first photometric evidence that ancient LMC Globular Clusters exhibit multiple stellar populations.

arXiv comment20 pages, 19 figures, submitted to MNRAS, deleted one sentence and fixed Figure 2 which had the same plot twice

References in corpus (37)

• The Dartmouth Stellar Evolution Database
• WFPC2 Stellar Photometry with HSTphot
• A Triple Main Sequence in the Globular Cluster NGC 2808
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• Multiple Stellar Populations in Globular Clusters
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• Na-O Anticorrelation and HB. VIII. Proton-capture elements and metallicities in 17 globular clusters from UVES spectra
• The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
• The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
• The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. V. Constraints on Formation Scenarios
• The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
• Multiple stellar populations in 47 Tucanae
• Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
• The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud
• Mixed Populations in Globular Clusters: Et Tu, 47 Tuc?
• Age as a Major Factor in the Onset of Multiple Populations in Stellar Clusters
• A Double Main Sequence in the Globular Cluster NGC 6397
• The Search for Multiple Populations in Magellanic Cloud Clusters II: The Detection of Multiple Populations in Three Intermediate-Age SMC Clusters
• Multiple stellar populations in Magellanic Cloud clusters. IV. The double main sequence of the young cluster NGC1755
• Multiple stellar populations in Magellanic Cloud clusters. V. The split main sequence of the young cluster NGC1866
• The Search for Multiple Populations in Magellanic Cloud Clusters III: No evidence for Multiple Populations in the SMC cluster NGC 419
• Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - I. The old LMC clusters NGC 1928, 1939 and Reticulum
• Absolute Ages and Distances of 22 GCs using Monte Carlo Main-Sequence Fitting
• Chemical composition of the old globular clusters NGC 1786, NGC 2210 and NGC 2257 in the Large Magellanic Cloud
• The Search for Multiple Populations in Magellanic Cloud Clusters I: Two Stellar Populations in the Small Magellanic Cloud Globular Cluster NGC 121
• Radial distributions of sub-populations in the globular cluster M15: a more centrally concentrated primordial population
• The ACS Survey of Galactic Globular Clusters XIV: Bayesian Single-Population Analysis of 69 Globular Clusters
• The Peculiar Radial Distribution of Multiple Populations in the massive globular cluster M80
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud: II. Relative ages and distances for six ancient globular clusters
• Uncovering Multiple Populations with Washington Photometry: I. The Globular Cluster NGC 1851
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud IV: Evidence for Multiple Populations in Hodge 11 and NGC 2210
• Investigating the Consistency of Stellar Evolution Models with Globular Cluster Observations via the Red Giant Branch Bump
• Multiple Populations in NGC 1851: Abundance Variations and UV Photometric Synthesis in the Washington and HST/WFC3 Systems

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• The Physics of Star Cluster Formation and Evolution
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• The search for multiple populations in Magellanic Clouds clusters - V. Correlation between cluster age and abundance spreads
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• Confirmation of a metallicity spread amongst first population stars in globular clusters
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• Chromosome maps of young LMC clusters: An additional case of coeval multiple populations
• Photometric characterization of multiple populations in star clusters: The impact of the first dredge-up
• SNe and their impact during the early evolution of Type I Globular Clusters
• Collision-induced mass loss and mass gain on an extremely massive star. An analytical approach and a static proto-globular cluster test-case
• Leveraging HST with MUSE: II. Na-abundance variations in intermediate age star clusters
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXII. Relative ages of multiple populations in five Globular Clusters
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud V: Multiple Populations in ancient Globular Clusters
• Is Fornax 4 the nuclear star cluster of the Fornax dwarf spheroidal galaxy?
• Role of host galaxy in the formation of multiple stellar populations: Analysis of NGC 1786 and NGC 1898
• Synthetic stellar spectra to study multiple populations in globular clusters: an extended grid and the effects on the integrated light
• Search strategies for supermassive stars in young clusters and application to nearby galaxies
• On the formation of globular clusters: comparison with observations
• Multiple stellar populations at less evolved stages-III: a possible helium spread in NGC 2210