Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - V. Multiple populations in ancient globular clusters
| Autor: | Sandro Villanova, Ata Sarajedini, Aaron J. Grocholski, C. K. Gilligan, M. C. Parisi, Douglas Geisler, Dougal Mackey, Paolo Ventura, Soung-Chul Yang, Roger E. Cohen, Brian Chaboyer, Jeffrey D. Cummings, R. Wagner-Kaiser |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
education.field_of_study 010308 nuclear & particles physics Population FOS: Physical sciences Astronomy and Astrophysics Astrophysics purl.org/becyt/ford/1.3 [https] Horizontal branch Astrophysics - Astrophysics of Galaxies 01 natural sciences Advanced Camera for Surveys Red-giant branch purl.org/becyt/ford/1 [https] Space and Planetary Science Globular cluster Astrophysics of Galaxies (astro-ph.GA) MAGELLANIC CLOUDS 0103 physical sciences STAR CLUSTERS: INDIVIDUAL: (NGC 1466 NGC 1841 NGC 2257 RETICULUM) [GALAXIES] education Large Magellanic Cloud 010303 astronomy & astrophysics Wide Field Camera 3 Main sequence |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, secondary population along the main-sequence. Reticulum does not show evidence for the presence of a redder population, but this GC has the least number of stars and Monte Carlo simulations indicate that the sample of main sequence stars is too small to robustly infer whether a redder population exists in this cluster. The second, redder, population of the other three clusters constitutes $\sim30-40\%$ of the total population along the main-sequence. This brings the total number of ancient LMC GCs with known split or broadened main-sequences to five. However, unlike for Hodge 11 and NGC 2210 (see arXiv:1904.01434), none of the clusters show evidence for multiple populations in the horizontal branch. We also do not find evidence of a second population along the Red Giant Branch (RGB). Comment: Accepted in MNRAS |
| Databáze: | OpenAIRE |
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