CAPOS: The bulge Cluster APOgee Survey V. Elemental abundances of the bulge globular cluster HP 1
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913794151677952 |
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| author | Henao, Lady Villanova, Sandro Geisler, Doug Fernández-Trincado, José G. |
| author_facet | Henao, Lady Villanova, Sandro Geisler, Doug Fernández-Trincado, José G. |
| contents | We have performed a detailed abundance analysis of 10 red giant members of the heavily obscured bulge globular cluster HP~1 using high-resolution, high S/N near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2), obtained as part of the bulge Cluster APOgee Survey (CAPOS). We investigate chemical abundances for a variety of species including the light (C,N), odd-Z (Al), $α$ (O,Mg,Si,S,Ca and Ti), Fe-peak (Ni,Fe), and neutron-capture (Ce) elements. The derived mean cluster metallicity is [Fe/H]$=-1.15\pm0.03$, with no evidence for an intrinsic metallicity spread. HP~1 exhibits a typical $α$-enrichment that follows the trend for similar metallicity Galactic GCs, such as NGC~288 and NGC~5904, although our [Si/Fe] abundances are relatively high. We find a significant nitrogen spread ($\sim 1$ dex), and a large fraction of nitrogen-enhanced ([N/Fe]$>+0.7$) stars that populate the cluster. We also detect intrinsic star-to-star spreads in [C/Fe], [O/Fe], [Al/Fe], and [Ca/Fe], which are (anti)correlated with several chemical species, indicating the prevalence of the multiple-population phenomenon in HP 1. We have uncovered for the first time a possible correlation between Ca and Al, although the sample is small. The mean $\langle$[Mg/Fe]$\rangle = +0.29$ and $\langle$[Al/Fe]$\rangle = +0.46$ place HP~1 into the region dominated by \textit{in-situ} GCs, supporting the \textit{in-situ} nature of this cluster. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03836 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | CAPOS: The bulge Cluster APOgee Survey V. Elemental abundances of the bulge globular cluster HP 1 Henao, Lady Villanova, Sandro Geisler, Doug Fernández-Trincado, José G. Astrophysics of Galaxies We have performed a detailed abundance analysis of 10 red giant members of the heavily obscured bulge globular cluster HP~1 using high-resolution, high S/N near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2), obtained as part of the bulge Cluster APOgee Survey (CAPOS). We investigate chemical abundances for a variety of species including the light (C,N), odd-Z (Al), $α$ (O,Mg,Si,S,Ca and Ti), Fe-peak (Ni,Fe), and neutron-capture (Ce) elements. The derived mean cluster metallicity is [Fe/H]$=-1.15\pm0.03$, with no evidence for an intrinsic metallicity spread. HP~1 exhibits a typical $α$-enrichment that follows the trend for similar metallicity Galactic GCs, such as NGC~288 and NGC~5904, although our [Si/Fe] abundances are relatively high. We find a significant nitrogen spread ($\sim 1$ dex), and a large fraction of nitrogen-enhanced ([N/Fe]$>+0.7$) stars that populate the cluster. We also detect intrinsic star-to-star spreads in [C/Fe], [O/Fe], [Al/Fe], and [Ca/Fe], which are (anti)correlated with several chemical species, indicating the prevalence of the multiple-population phenomenon in HP 1. We have uncovered for the first time a possible correlation between Ca and Al, although the sample is small. The mean $\langle$[Mg/Fe]$\rangle = +0.29$ and $\langle$[Al/Fe]$\rangle = +0.46$ place HP~1 into the region dominated by \textit{in-situ} GCs, supporting the \textit{in-situ} nature of this cluster. |
| title | CAPOS: The bulge Cluster APOgee Survey V. Elemental abundances of the bulge globular cluster HP 1 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.03836 |