Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Heiger, Mairéad E Ji, Alexander P Li, Ting S Simon, Joshua D Limberg, Guilherme Carballo-Bello, Julio A Cerny, William Chaturvedi, Astha Chiti, Anirudh Choi, Yumi Crnojević, Denija Martínez-Vázquez, Clara E Medina, Gustavo E Mutlu-Pakdil, Burçin Navabi, Mahdieh Noël, Noelia E D Pace, Andrew B Placco, Vinicius M Riley, Alexander H Sakowska, Joanna D Stringfellow, Guy S |
| author_facet | Heiger, Mairéad E Ji, Alexander P Li, Ting S Simon, Joshua D Limberg, Guilherme Carballo-Bello, Julio A Cerny, William Chaturvedi, Astha Chiti, Anirudh Choi, Yumi Crnojević, Denija Martínez-Vázquez, Clara E Medina, Gustavo E Mutlu-Pakdil, Burçin Navabi, Mahdieh Noël, Noelia E D Pace, Andrew B Placco, Vinicius M Riley, Alexander H Sakowska, Joanna D Stringfellow, Guy S |
| contents | We present detailed chemical abundances of the brightest star in each of the ultra-faint dwarf galaxies Eridanus IV and Centaurus I using high-resolution Magellan/MIKE spectroscopy. The brightest star in Centaurus I, CenI-5136, is a very metal-poor star with metallicity [Fe/H] = $-2.52\pm0.17$ and chemical abundances typical of a star in an ultra-faint dwarf galaxy. We confirm that the star in Eridanus IV, EriIV-9808, is extremely metal-poor ([Fe/H] = $-3.25\pm0.19$) and find that it is carbon-enhanced, with [C/Fe] = $1.07\pm0.34$, as is common for many stars at this metallicity. Both stars are also neutron-capture deficient, which is typical of stars in ultra-faint dwarf galaxies, but less common in other environments. We consider possible enrichment scenarios for EriIV-9808 and tentatively conclude that it is unlikely to be the descendant of a single Pop III progenitor, despite its carbon-enhancement and low metallicity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_11012 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I Heiger, Mairéad E Ji, Alexander P Li, Ting S Simon, Joshua D Limberg, Guilherme Carballo-Bello, Julio A Cerny, William Chaturvedi, Astha Chiti, Anirudh Choi, Yumi Crnojević, Denija Martínez-Vázquez, Clara E Medina, Gustavo E Mutlu-Pakdil, Burçin Navabi, Mahdieh Noël, Noelia E D Pace, Andrew B Placco, Vinicius M Riley, Alexander H Sakowska, Joanna D Stringfellow, Guy S Astrophysics of Galaxies Solar and Stellar Astrophysics We present detailed chemical abundances of the brightest star in each of the ultra-faint dwarf galaxies Eridanus IV and Centaurus I using high-resolution Magellan/MIKE spectroscopy. The brightest star in Centaurus I, CenI-5136, is a very metal-poor star with metallicity [Fe/H] = $-2.52\pm0.17$ and chemical abundances typical of a star in an ultra-faint dwarf galaxy. We confirm that the star in Eridanus IV, EriIV-9808, is extremely metal-poor ([Fe/H] = $-3.25\pm0.19$) and find that it is carbon-enhanced, with [C/Fe] = $1.07\pm0.34$, as is common for many stars at this metallicity. Both stars are also neutron-capture deficient, which is typical of stars in ultra-faint dwarf galaxies, but less common in other environments. We consider possible enrichment scenarios for EriIV-9808 and tentatively conclude that it is unlikely to be the descendant of a single Pop III progenitor, despite its carbon-enhancement and low metallicity. |
| title | Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2508.11012 |