ACACIAS II: Element abundances for 39 stars in the dwarf galaxy Sculptor

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ID: 329380
2026
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Abstract
Abstract Element abundances in nearby galaxies provide insights into their chemical enrichment histories and place the Milky Way and its neighbours in a broader cosmological context. These systems can be studied through individual stars, whose resolved spectra enable the construction of a chemical abundance census of the Local Group. We present the second stage of the ACACIAS program, which aims to build the first homogeneous dataset of stellar abundances across dwarf galaxies spanning a range of masses for comparison with Milky Way properties. We analyse low-resolution (R = 1800), low-SNR (~25) spectra obtained with the Multi Unit Spectroscopic Explorer (MUSE) for 39 stars in the Sculptor dwarf spheroidal galaxy. Using the data-driven method TheCannon, we combine high-fidelity labels from the APOGEE survey with MUSE-like LAMOST spectra to analyse the MUSE data. This enables the determination of [Mg/Fe], [Mn/Fe], [C/Fe], [N/Fe], and [Al/Fe] on the same abundance scale as APOGEE, with precisions of σ = 0.09 − 0.37dex. Comparing different model configurations, we show that [Mg/Fe], [Mn/Fe], and [C/Fe] are best recovered from targeted spectral windows, whereas stellar parameters and [Al/Fe] benefit from full-spectrum information with telluric masking. This reflects the complementary strengths of restricted-window models, which recover abundances from direct spectral features, and full-spectrum models, which exploit correlations with other labels when diagnostic features are weak or absent. Our approach demonstrates the potential of low-resolution, low-SNR stellar spectra to build more homogeneous datasets for extragalactic archaeology to better understand the chemical enrichment diversity of the Local Group.
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Authors Anell Cornejo-Cárdenas, Sven Buder, Melissa Ness, J Trevor Mendel
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1753
URL
https://doi.org/10.1093/mnras/stag1753
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