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Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I

by Simon, Joshua D , Sakowska, Joanna D , Crnojević, Denija , Chiti, Anirudh , Stringfellow, Guy S , Carballo-Bello, Julio A , Martínez-Vázquez, Clara E , Limberg, Guilherme , Heiger, Mairéad E , Medina, Gustavo E , Mutlu-Pakdil, Burçin , Choi, Yumi , Placco, Vinicius M , Pace, Andrew B , Noël, Noelia E D , Chaturvedi, Astha , Cerny, William , Navabi, Mahdieh , Ji, Alexander P , Riley, Alexander H , Li, Ting S

in Abundance / Carbon / Dwarf galaxies / Heavy metals / Iron / Metallicity / Nuclear capture

2025

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Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I

in Abundance / Carbon / Dwarf galaxies / Heavy metals / Iron / Metallicity / Nuclear capture

2025

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Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I

in Abundance / Carbon / Dwarf galaxies / Heavy metals / Iron / Metallicity / Nuclear capture

2025

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Paper

Not-so-heavy metal(s): Chemical Abundances in the Ultra-faint Dwarf Galaxies Eridanus IV and Centaurus I

Simon, Joshua D,

Sakowska, Joanna D,

Crnojević, Denija,

Chiti, Anirudh,

Stringfellow, Guy S,

Carballo-Bello, Julio A,

Martínez-Vázquez, Clara E,

Limberg, Guilherme,

Heiger, Mairéad E,

Medina, Gustavo E,

Mutlu-Pakdil, Burçin,

Choi, Yumi,

Placco, Vinicius M,

Pace, Andrew B,

Noël, Noelia E D,

Chaturvedi, Astha,

Cerny, William,

Navabi, Mahdieh,

Ji, Alexander P,

Riley, Alexander H,

Li, Ting S

2025

Overview

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.

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Publisher

Cornell University Library, arXiv.org

Subject

/ Carbon

/ Iron