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The DECam MAGIC Survey: Spectroscopic Follow-up of the Most Metal-Poor Stars in the Distant Milky Way Halo

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arxiv 2506.19163 v1 pith:TBIJHH7A submitted 2025-06-23 astro-ph.GA astro-ph.SR

Vinicius M. Placco , Guilherme Limberg , Anirudh Chiti , Deepthi S. Prabhu , Alexander P. Ji , Fabrícia O. Barbosa , William Cerny , Andrew B. Pace
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Guy S. Stringfellow David J. Sand Clara E. Martínez-Vázquez Alexander H. Riley Silvia Rossi Noelia E. D. Noël A. Katherina Vivas Gustavo E. Medina Alex Drlica-Wagner Joanna D. Sakowska Burçin Mutlu-Pakdil Pol Massana Julio A. Carballo-Bello Yumi Choi Denija Crnojević Chin Yi Tan
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In this work, we present high-resolution spectroscopic observations for six metal-poor stars with [Fe/H]<-3 (including one with [Fe/H]<-4), selected using narrow-band Ca II HK photometry from the DECam MAGIC Survey. The spectroscopic data confirms the accuracy of the photometric metallicities and allows for the determination of chemical abundances for 16 elements, from carbon to barium. The program stars have chemical abundances consistent with this metallicity range. A kinematic/dynamical analysis suggests that all program stars belong to the distant Milky Way halo population (heliocentric distances 35 < dhelio/kpc < 55), including three with high-energy orbits that might have been associated with the Magellanic system and one, J0026-5445, having parameters consistent with being a member of the Sagittarius stream. The remaining two stars show kinematics consistent with the Gaia-Sausage/Enceladus dwarf galaxy merger. J0433-5548, with [Fe/H]=-4.12, is a carbon-enhanced ultra metal-poor star, with [C/Fe]=+1.73. This star is believed to be a bona fide second-generation star, and its chemical abundance pattern was compared with yields from metal-free supernova models. Results suggest that J0433-5548 could have been formed from a gas cloud enriched by a single supernova explosion from a ~11Mo star in the early universe. The successful identification of such objects demonstrates the reliability of photometric metallicity estimates, which can be used for target selection and statistical studies of faint targets in the Milky Way and its satellite population. These discoveries illustrate the power of measuring chemical abundances of metal-poor Milky Way halo stars to learn more about early galaxy formation and evolution.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The DECam MAGIC Survey: Uncovering the Tidal Tails of the Crater II Dwarf Galaxy

    astro-ph.GA 2026-02 conditional novelty 6.0 of 10

    Calcium-strength photometry identifies 37 candidate stars in Crater II's tidal tails, implying the dwarf has lost at least 25% of its initial stellar mass.

  2. Discovery of an $\rm[Fe/H] \sim -4.8$ Star in $Gaia$ XP Spectra

    astro-ph.GA 2025-07 conditional novelty 6.0 of 10

    GDR3_526285 is a red giant with [Fe/H] = -4.82 +/- 0.25, one of the most iron-poor stars known, whose carbon upper limit leaves open a rare non-carbon-enhanced origin.

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