The HST Large Programme on omega Centauri -- VI. The radial gradient of the stellar populations
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| Format: | Preprint |
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2024
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| _version_ | 1866911894473801728 |
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| author | Scalco, Michele Bedin, Luigi Vesperini, Enrico |
| author_facet | Scalco, Michele Bedin, Luigi Vesperini, Enrico |
| contents | In this paper we present the analysis of Hubble Space Telescope (HST) observations of the globular cluster Omega Centauri. Our analysis combines data obtained in this work with previously published HST data from an earlier article of this series and encompasses a broad portion of the cluster's radial extension. Our findings reveal a significant radial variation in the fraction of stars within the two most populous stellar populations showing that one of the main second-population groups (referred to as bMS) is more centrally concentrated than the first-population group (referred to as rMS). Additionally, we explore the spatial variations of the other less populous stellar populations (referred to as MSa and MSd) and find a qualitatively similar, but weaker, radial decrease in the fraction of stars in these populations at larger distances from the cluster centre. Only one of the populations identified (MSe) does not show any significant radial variation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_19939 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The HST Large Programme on omega Centauri -- VI. The radial gradient of the stellar populations Scalco, Michele Bedin, Luigi Vesperini, Enrico Astrophysics of Galaxies Solar and Stellar Astrophysics In this paper we present the analysis of Hubble Space Telescope (HST) observations of the globular cluster Omega Centauri. Our analysis combines data obtained in this work with previously published HST data from an earlier article of this series and encompasses a broad portion of the cluster's radial extension. Our findings reveal a significant radial variation in the fraction of stars within the two most populous stellar populations showing that one of the main second-population groups (referred to as bMS) is more centrally concentrated than the first-population group (referred to as rMS). Additionally, we explore the spatial variations of the other less populous stellar populations (referred to as MSa and MSd) and find a qualitatively similar, but weaker, radial decrease in the fraction of stars in these populations at larger distances from the cluster centre. Only one of the populations identified (MSe) does not show any significant radial variation. |
| title | The HST Large Programme on omega Centauri -- VI. The radial gradient of the stellar populations |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2405.19939 |