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
| Autor: | M. C. Parisi, Soung-Chul Yang, Roger E. Cohen, Aaron J. Grocholski, Brian Chaboyer, R. Wagner-Kaiser, Sandro Villanova, Dougal Mackey, Douglas Geisler, Paolo Ventura, Ata Sarajedini, C. K. Gilligan, Jeffrey D. Cummings |
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| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Population FOS: Physical sciences Astrophysics 01 natural sciences Advanced Camera for Surveys purl.org/becyt/ford/1 [https] Primary (astronomy) MAGELLANIC CLOUDS 0103 physical sciences Cluster (physics) 10. No inequality Large Magellanic Cloud education 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics education.field_of_study STAR CLUSTERS: INDIVIDUAL (HODGE 11 NGC 2210) [GALAXIES] Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Horizontal branch Astrophysics - Astrophysics of Galaxies Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Globular cluster Wide Field Camera 3 |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | 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. 20 pages, 19 figures, submitted to MNRAS, deleted one sentence and fixed Figure 2 which had the same plot twice |
| Databáze: | OpenAIRE |
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