• Flaugher, B. et al. The dark energy camera. Astron. J. 150, 150 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Beers, T. C., Preston, G. W. & Shectman, S. A. A search for stars of very low metal abundance. I. Astron. J. 90, 2089–2102 (1985).

    Article 
    ADS 

    Google Scholar
     

  • Keller, S. C. et al. The SkyMapper Telescope and The Southern Sky Survey. Publ. Astron. Soc. Aust. 24, 1–12 (2007).

    Article 
    ADS 
    MathSciNet 

    Google Scholar
     

  • Starkenburg, E. et al. The Pristine survey I. Mining the Galaxy for the most metal-poor stars. Mon. Not. R. Astron. Soc. 471, 2587–2604 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Gaia Collaboration et al. Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties. Astron. Astrophys. 595, A2 (2016).

    Article 

    Google Scholar
     

  • Gaia Collaboration et al. Gaia Data Release 3. Summary of the content and survey properties. Astron. Astrophys. 674, A1 (2023).

    Article 

    Google Scholar
     

  • Battaglia, G., Taibi, S., Thomas, G. F. & Fritz, T. K. Gaia early DR3 systemic motions of Local Group dwarf galaxies and orbital properties with a massive Large Magellanic Cloud. Astron. Astrophys. 657, A54 (2022).

    Article 
    ADS 

    Google Scholar
     

  • Marshall, J. L. et al. McLean, I. S. & Casali, M. M. The MagE spectrograph. In Ground-based and Airborne Instrumentation for Astronomy II of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (eds McLean, I. S. & Casali, M. M.) 7014, 701454 (SPIE, 2008).

  • Pace, A. B. et al. Spectroscopic analysis of Pictor II: a very low metallicity ultra-faint dwarf galaxy bound to the Large Magellanic Cloud. Open J. Astrophys. 8, 112 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Vernet, J. et al. X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope. Astron. Astrophys. 536, A105 (2011).

    Article 

    Google Scholar
     

  • Cayrel, R. et al. First stars V—abundance patterns from C to Zn and supernova yields in the early Galaxy. Astron. Astrophys. 416, 1117–1138 (2004).

    Article 
    ADS 

    Google Scholar
     

  • Heger, A. & Woosley, S. E. Nucleosynthesis and evolution of massive metal-free stars. Astrophys. J. 724, 341–373 (2010).

    Article 
    ADS 

    Google Scholar
     

  • Ji, A. P., Frebel, A. & Bromm, V. Preserving chemical signatures of primordial star formation in the first low-mass stars. Mon. Not. R. Astron. Soc. 454, 659–674 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Koutsouridou, I. et al. The energy distribution of the first supernovae. Mon. Not. R. Astron. Soc. 525, 190–210 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Vanni, I., Salvadori, S., Skúladóttir, Á, Rossi, M. & Koutsouridou, I. Characterizing the true descendants of the first stars. Mon. Not. R. Astron. Soc. 526, 2620–2644 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Brown, T. M. et al. The quenching of the ultra-faint dwarf galaxies in the reionization era. Astrophys. J. 796, 91 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Simon, J. D. & Geha, M. The kinematics of the ultra-faint Milky Way satellites: solving the missing satellite problem. Astrophys. J. 670, 313–331 (2007).

    Article 
    ADS 

    Google Scholar
     

  • Searle, L. & Zinn, R. Composition of halo clusters and the formation of the galactic halo. Astrophys. J. 225, 357–379 (1978).

    Article 
    ADS 

    Google Scholar
     

  • Simon, J. D. The faintest dwarf galaxies. Annu. Rev. Astron. Astrophys. 57, 375–415 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Hartwig, T. et al. Descendants of the first stars: the distinct chemical signature of second-generation stars. Mon. Not. R. Astron. Soc. 478, 1795–1810 (2018).

    Article 
    ADS 

    Google Scholar
     

  • Bonifacio, P., Caffau, E., François, P. & Spite, M. The most metal-poor stars. Astron. Astrophys. Rev. 33, 2 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Beers, T. C. & Christlieb, N. The discovery and analysis of very metal-poor stars in the galaxy. Annu. Rev. Astron. Astrophys. 43, 531–580 (2005).

    Article 
    ADS 

    Google Scholar
     

  • Cooke, R. J. & Madau, P. Carbon-enhanced metal-poor stars: relics from the dark ages. Astrophys. J. 791, 116 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Iwamoto, N., Umeda, H., Tominaga, N., Nomoto, K. & Maeda, K. The first chemical enrichment in the universe and the formation of hyper metal-poor stars. Science 309, 451–453 (2005).

    Article 
    ADS 

    Google Scholar
     

  • Meynet, G., Ekström, S. & Maeder, A. The early star generations: the dominant effect of rotation on the CNO yields. Astron. Astrophys. 447, 623–639 (2006).

    Article 
    ADS 

    Google Scholar
     

  • Bromm, V. & Loeb, A. The formation of the first low-mass stars from gas with low carbon and oxygen abundances. Nature 425, 812–814 (2003).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A., Johnson, J. L. & Bromm, V. Probing the formation of the first low-mass stars with stellar archaeology. Mon. Not. R. Astron. Soc. 380, L40–L44 (2007).

    Article 
    ADS 

    Google Scholar
     

  • Hartwig, T. & Yoshida, N. Formation of carbon-enhanced metal-poor stars as a consequence of inhomogeneous metal mixing. Astrophys. J. Lett. 870, L3 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Skúladóttir, Á et al. Zero-metallicity hypernova uncovered by an ultra-metal-poor star in the sculptor dwarf spheroidal galaxy. Astrophys. J. Lett. 915, L30 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Skúladóttir, Á, Vanni, I., Salvadori, S. & Lucchesi, R. Tracing population III supernovae with extreme energies through the Sculptor dwarf spheroidal galaxy. Astron. Astrophys. 681, A44 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Howes, L. M. et al. Extremely metal-poor stars from the cosmic dawn in the bulge of the Milky Way. Nature 527, 484–487 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Jablonka, P. et al. The early days of the Sculptor dwarf spheroidal galaxy. Astron. Astrophys. 583, A67 (2015).

    Article 

    Google Scholar
     

  • Arentsen, A. et al. The Pristine Inner Galaxy Survey (PIGS) III: carbon-enhanced metal-poor stars in the bulge. Mon. Not. R. Astron. Soc. 505, 1239–1253 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A. et al. Enrichment by extragalactic first stars in the Large Magellanic Cloud. Nat. Astron. 8, 637–647 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Sestito, F. et al. The Pristine Inner Galaxy Survey (PIGS): X. Probing the early chemical evolution of the Sagittarius dwarf galaxy with carbon abundances. Astron. Astrophys. 690, A333 (2024).

    Article 

    Google Scholar
     

  • Lucchesi, R. et al. Extremely metal-poor stars in the Fornax and Carina dwarf spheroidal galaxies. Astron. Astrophys. 686, A266 (2024).

    Article 

    Google Scholar
     

  • Ryan, S. G., Aoki, W., Norris, J. E. & Beers, T. C. The origins of two classes of carbon-enhanced, metal-poor stars. Astrophys. J. 635, 349–354 (2005).

    Article 
    ADS 

    Google Scholar
     

  • Abohalima, A. & Frebel, A. JINAbase—a database for chemical abundances of metal-poor stars. Astrophys. J. Suppl. Ser. 238, 36 (2018).

    Article 
    ADS 

    Google Scholar
     

  • Aoki, W., Norris, J. E., Ryan, S. G., Beers, T. C. & Ando, H. Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043: a new class of extremely metal poor stars with excesses of magnesium and silicon. Astrophys. J. Lett. 576, L141–L144 (2002).

    Article 
    ADS 

    Google Scholar
     

  • Keller, S. C. et al. A single low-energy, iron-poor supernova as the source of metals in the star SMSS J031300.36-670839.3. Nature 506, 463–466 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Woosley, S. E. & Weaver, T. A. The evolution and explosion of massive stars. II. Explosive hydrodynamics and nucleosynthesis. Astrophys. J. Suppl. Ser. 101, 181 (1995).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A. & Norris, J. E. Near-field cosmology with extremely metal-poor stars. Annu. Rev. Astron. Astrophys. 53, 631–688 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Bromm, V., Yoshida, N., Hernquist, L. & McKee, C. F. The formation of the first stars and galaxies. Nature 459, 49–54 (2009).

    Article 
    ADS 

    Google Scholar
     

  • Naidu, R. P. et al. All the Little Things in Abell 2744: >1,000 gravitationally lensed dwarf galaxies at z = 0 − 9 from JWST NIRCam Grism spectroscopy. Preprint at https://arxiv.org/abs/2410.01874 (2024).

  • Nakajima, K. et al. An ultra-faint, chemically primitive galaxy forming at the epoch of reionization. Preprint at https://arxiv.org/abs/2506.11846 (2025).

  • Bunker, A. J. et al. JADES NIRSpec spectroscopy of GN-z11: Lyman-α emission and possible enhanced nitrogen abundance in a z = 10.60 luminous galaxy. Astron. Astrophys. 677, A88 (2023).

    Article 

    Google Scholar
     

  • Cameron, A. J., Katz, H., Rey, M. P. & Saxena, A. Nitrogen enhancements 440 Myr after the big bang: supersolar N/O, a tidal disruption event, or a dense stellar cluster in GN-z11?. Mon. Not. R. Astron. Soc. 523, 3516–3525 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A. et al. An extended halo around an ancient dwarf galaxy. Nat. Astron. 5, 392–400 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Longeard, N. et al. The Pristine dwarf galaxy survey—IV. Probing the outskirts of the dwarf galaxy Boötes I. Mon. Not. R. Astron. Soc. 516, 2348–2362 (2022).

    Article 
    ADS 

    Google Scholar
     

  • Barbosa, F. O. et al. The DECam MAGIC Survey: a wide-field photometric metallicity study of the Sculptor dwarf spheroidal galaxy. Astrophys. J. 993, 77 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Placco, V. M. et al. The DECam MAGIC Survey: Spectroscopic follow-up of the most metal-poor stars in the distant Milky Way halo. Astrophys. J. 991, 101 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A., Frebel, A., Jerjen, H., Kim, D. & Norris, J. E. Stellar metallicities from SkyMapper Photometry I: a study of the Tucana II ultra-faint dwarf galaxy. Astrophys. J. 891, 8 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A. et al. Stellar metallicities from SkyMapper Photometry. II. Precise photometric metallicities of ~280,000 giant stars with [Fe/H] < −0.75 in the Milky Way. Astrophys. J. Suppl. Ser. 254, 31 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Alvarez, R. & Plez, B. Near-infrared narrow-band photometry of M-giant and Mira stars: models meet observations. Astron. Astrophys. 330, 1109–1119 (1998).

    ADS 

    Google Scholar
     

  • Plez, B. Turbospectrum: code for spectral synthesis. Astrophysics Source Code Library record ascl:1205.004 Github https://github.com/bertrandplez/Turbospectrum2019 (2012).

  • Gustafsson, B. et al. A grid of MARCS model atmospheres for late-type stars. I. Methods and general properties. Astron. Astrophys. 486, 951–970 (2008).

    Article 
    ADS 

    Google Scholar
     

  • Piskunov, N. E., Kupka, F., Ryabchikova, T. A., Weiss, W. W. & Jeffery, C. S. VALD: The Vienna Atomic Line Data Base. Astron. Astrophys. Suppl. 112, 525 (1995).

    ADS 

    Google Scholar
     

  • Ryabchikova, T. et al. A major upgrade of the VALD database. Physica Scripta 90, 054005 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Lindegren, L. et al. Gaia Early Data Release 3. The astrometric solution. Astron. Astrophys. 649, A2 (2021).

    Article 

    Google Scholar
     

  • Dotter, A. et al. The Dartmouth Stellar Evolution Database. Astrophys. J. Suppl. Ser. 178, 89–101 (2008).

    Article 
    ADS 

    Google Scholar
     

  • Drlica-Wagner, A. et al. An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey. Astrophys. J. Lett. 833, L5 (2016).

    Article 
    ADS 

    Google Scholar
     

  • Pace, A. B., Erkal, D. & Li, T. S. Proper motions, orbits, and tidal influences of Milky Way dwarf spheroidal galaxies. Astrophys. J. 940, 136 (2022).

    Article 
    ADS 

    Google Scholar
     

  • Kelson, D. D. Optimal techniques in two-dimensional spectroscopy: background subtraction for the 21st century. Publ. Astron. Soc. Pac. 115, 688–699 (2003).

    Article 
    ADS 

    Google Scholar
     

  • Freudling, W. et al. Automated data reduction workflows for astronomy. The ESO Reflex environment. Astron. Astrophys. 559, A96 (2013).

    Article 

    Google Scholar
     

  • Chubak, C. et al. Precise radial velocities of 2046 nearby FGKM stars and 131 standards. Preprint at https://arxiv.org/abs/1207.6212 (2012).

  • Ou, X. et al. Signatures of tidal disruption of the Hercules ultrafaint dwarf galaxy. Astrophys. J. 966, 33 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Simon, J. D. et al. Nearest neighbor: the low-mass Milky Way satellite Tucana III. Astrophys. J. 838, 11 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Li, T. S. et al. Farthest neighbor: the distant Milky Way satellite Eridanus II. Astrophys. J. 838, 8 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Sneden, C. A. Carbon and Nitrogen Abundances in Metal-Poor Stars. PhD thesis, Univ. of Texas, Austin (1973).

  • Sobeck, J. S. et al. The abundances of neutron-capture species in the very metal-poor globular cluster M15: a uniform analysis of red giant branch and red horizontal branch stars. Astron. J. 141, 175 (2011).

    Article 
    ADS 

    Google Scholar
     

  • Castelli, F. et al. New grids of ATLAS9 model atmospheres. In Modelling of Stellar Atmospheres—IAU Symposium (eds Piskunov N. et al.) 210, A20 (The Astronomical Society of the Pacific, 2003).

  • Kurucz, R. L. ATLAS12, SYNTHE, ATLAS9, WIDTH9, et cetera. Mem. Soc. Astron. Ital. Suppl. 8, 14 (2005).

    ADS 

    Google Scholar
     

  • Masseron, T. et al. CH in stellar atmospheres: an extensive linelist. Astron. Astrophys. 571, A47 (2014).

    Article 

    Google Scholar
     

  • Sneden, C., Lucatello, S., Ram, R. S., Brooke, J. S. A. & Bernath, P. Line lists for the A2Π − X2Σ+ (red) and B2Σ+ − X2Σ+ (violet) systems of CN, 13C14N, and 12C15N, and application to astronomical spectra. Astrophys. J. Suppl. Ser. 214, 26 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Ruffoni, M. P. et al. Fe I oscillator strengths for the Gaia-ESO survey. Mon. Not. R. Astron. Soc. 441, 3127–3136 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Den Hartog, E. A. et al. Fe I oscillator strengths for transitions from high-lying even-parity levels. Astrophys. J. Suppl. Ser. 215, 23 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Belmonte, M. T. et al. Fe I oscillator strengths for transitions from high-lying odd-parity levels. Astrophys. J. 848, 125 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Pehlivan Rhodin, A., Hartman, H., Nilsson, H. & Jönsson, P. Experimental and theoretical oscillator strengths of Mg I for accurate abundance analysis. Astron. Astrophys. 598, A102 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Kramida, A., Ralchenko, Y., Reader, J. & NIST ASD Team. NIST Atomic Spectra Database (ver. 5.12). National Institute of Standards and Technology https://physics.nist.gov/asd (2024, accessed 18 May 2025).

  • Den Hartog, E. A. et al. Atomic transition probabilities of neutral calcium. Astrophys. J. Suppl. Ser. 255, 27 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Placco, V. M. et al. Linemake: an atomic and molecular line list generator. Res. Notes Am. Astron. Soc. 5, 92 (2021).

    ADS 

    Google Scholar
     

  • Casey, A. R. A Tale of Tidal Tales in the Milky Way. PhD thesis, Australian National University, Canberra (2014).

  • alexji/moog17scat. GitHub https://github.com/alexji/moog17scat (2026).

  • Atomic and molecular line list generator. GitHub http://github.com/vmplacco/linemake (2026).

  • Spectroscopy made harder. GitHub http://github.com/andycasey/smhr (2026).

  • Frebel, A., Casey, A. R., Jacobson, H. R. & Yu, Q. Deriving stellar effective temperatures of metal-poor stars with the excitation potential method. Astrophys. J. 769, 57 (2013).

    Article 
    ADS 

    Google Scholar
     

  • Ji, A. P. et al. The southern stellar stream spectroscopic survey (S5): chemical abundances of seven stellar streams. Astron. J. 160, 181 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Placco, V. M., Frebel, A., Beers, T. C. & Stancliffe, R. J. Carbon-enhanced metal-poor star frequencies in the galaxy: corrections for the effect of evolutionary status on carbon abundances. Astrophys. J. 797, 21 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Ji, A. P. et al. Detailed abundances in the ultra-faint magellanic satellites Carina II and III. Astrophys. J. 889, 27 (2020).

    Article 
    ADS 

    Google Scholar
     

  • JINAbase: a database for metal-poor stars. JINAbase http://jinabase.pythonanywhere.com (2026).

  • Ezzeddine, R., Frebel, A. & Plez, B. Ultra-metal-poor stars: spectroscopic determination of stellar atmospheric parameters using iron non-LTE line abundances. Astrophys. J. 847, 142 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Storm, N. et al. Observational constraints on the origin of the elements. IX. 3D NLTE abundances of metals in the context of Galactic Chemical Evolution models and 4MOST. Mon. Not. R. Astron. Soc. 538, 3284–3313 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Conroy, C. et al. Resolving the metallicity distribution of the Stellar Halo with the H3 Survey. Astrophys. J. 887, 237 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Youakim, K. et al. The Pristine Survey—VIII. The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime. Mon. Not. R. Astron. Soc. 492, 4986–5002 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A., Mardini, M. K., Frebel, A. & Daniel, T. The metal-poor metallicity distribution of the ancient Milky Way. Astrophys. J. Lett. 911, L23 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Tolstoy, E. et al. A 3D view of dwarf galaxies with Gaia and VLT/FLAMES. I. The Sculptor dwarf spheroidal. Astron. Astrophys. 675, A49 (2023).

    Article 

    Google Scholar
     

  • Barklem, P. S., Piskunov, N. & O’Mara, B. J. Self-broadening in Balmer line wing formation in stellar atmospheres. Astron. Astrophys. 363, 1091–1105 (2000).

    ADS 

    Google Scholar
     

  • Barklem, P. S. et al. Detailed analysis of Balmer lines in cool dwarf stars. Astron. Astrophys. 385, 951–967 (2002).

    Article 
    ADS 

    Google Scholar
     

  • barklem/public-data. GitHub http://github.com/barklem/public-data (2026).

  • Thornton, K., Gaudlitz, M., Janka, H. T. & Steinmetz, M. Energy input and mass redistribution by supernovae in the interstellar medium. Astrophys. J. 500, 95–119 (1998).

    Article 
    ADS 

    Google Scholar
     

  • Tominaga, N., Umeda, H. & Nomoto, K. Supernova nucleosynthesis in population III 13–50 Msolar stars and abundance patterns of extremely metal-poor stars. Astrophys. J. 660, 516–540 (2007).

    Article 
    ADS 

    Google Scholar
     

  • Yong, D. et al. The most metal-poor stars. III. The metallicity distribution function and carbon-enhanced metal-poor fraction. Astrophys. J. 762, 27 (2013).

    Article 
    ADS 

    Google Scholar
     

  • Roederer, I. U. et al. A search for stars of very low metal abundance. VI. Detailed abundances of 313 metal-poor stars. Astron. J. 147, 136 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Yong, D. et al. High-resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1. Mon. Not. R. Astron. Soc. 507, 4102–4119 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Li, H. et al. Four-hundred very metal-poor stars studied with LAMOST and Subaru. II. Elemental abundances. Astrophys. J. 931, 147 (2022).

    Article 
    ADS 

    Google Scholar
     

  • Placco, V. M. et al. Observational constraints on first-star nucleosynthesis. II. Spectroscopy of an ultra metal-poor CEMP-no Star. Astrophys. J. 833, 21 (2016).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A. et al. Chemical abundance signature of J0023+0307: a second-generation main-sequence star with [Fe/H] <−6. Astrophys. J. 871, 146 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Hansen, T. et al. An elemental assay of very, extremely, and ultra-metal-poor stars. Astrophys. J. 807, 173 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Aguado, D. S., Allende Prieto, C., González Hernández, J. I., Rebolo, R. & Caffau, E. New ultra metal-poor stars from SDSS: follow-up GTC medium-resolution spectroscopy. Astron. Astrophys. 604, A9 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Aguado, D. S., González Hernández, J. I., Allende Prieto, C. & Rebolo, R. WHT follow-up observations of extremely metal-poor stars identified from SDSS and LAMOST. Astron. Astrophys. 605, A40 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Plez, B. & Cohen, J. G. Analysis of the carbon-rich very metal-poor dwarf G77-61. Astron. Astrophys. 434, 1117–1124 (2005).

    Article 
    ADS 

    Google Scholar
     

  • González Hernández, J. I., Aguado, D. S., Allende Prieto, C., Burgasser, A. J. & Rebolo, R. The extreme CNO-enhanced composition of the primitive iron-poor dwarf star J0815+4729. Astrophys. J. Lett. 889, L13 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Bonifacio, P. et al. TOPoS. II. On the bimodality of carbon abundance in CEMP stars implications on the early chemical evolution of galaxies. Astron. Astrophys. 579, A28 (2015).

    Article 

    Google Scholar
     

  • Caffau, E. et al. An extremely primitive star in the Galactic halo. Nature 477, 67–69 (2011).

    Article 
    ADS 

    Google Scholar
     

  • Bonifacio, P. et al. TOPoS. IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars. Astron. Astrophys. 612, A65 (2018).

    Article 

    Google Scholar
     

  • Placco, V. M. et al. Metal-poor stars observed with the Magellan Telescope. III. New extremely and ultra metal-poor stars from SDSS/SEGUE and insights on the formation of ultra metal-poor stars. Astrophys. J. 809, 136 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A., Chiti, A., Ji, A. P., Jacobson, H. R. & Placco, V. M. SD 1313-0019: another second-generation star with [Fe/H] = −5.0, observed with the Magellan Telescope. Astrophys. J. Lett. 810, L27 (2015).

    Article 
    ADS 

    Google Scholar
     

  • Caffau, E. et al. TOPoS. I. Survey design and analysis of the first sample. Astron. Astrophys. 560, A71 (2013).

    Article 

    Google Scholar
     

  • Starkenburg, E. et al. The Pristine survey IV: approaching the Galactic metallicity floor with the discovery of an ultra-metal-poor star. Mon. Not. R. Astron. Soc. 481, 3838–3852 (2018).

    Article 
    ADS 

    Google Scholar
     

  • Aguado, D. S. et al. Follow-up observations of extremely metal-poor stars identified from SDSS. Astron. Astrophys. 593, A10 (2016).

    Article 

    Google Scholar
     

  • Mardini, M. K. et al. The chemical abundance pattern of the extremely metal-poor thin disc star 2MASS J1808-5104 and its origins. Mon. Not. R. Astron. Soc. 517, 3993–4004 (2022).

    Article 
    ADS 

    Google Scholar
     

  • François, P. et al. Detailed abundances in a sample of very metal-poor stars. Astron. Astrophys. 642, A25 (2020).

    Article 

    Google Scholar
     

  • Nordlander, T. et al. The lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1. Mon. Not. R. Astron. Soc. 488, L109–L113 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Lardo, C. et al. The Pristine survey—XIV. Chemical analysis of two ultra-metal-poor stars. Mon. Not. R. Astron. Soc. 508, 3068–3083 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Placco, V. M. et al. SPLUS J210428.01-004934.2: an ultra metal-poor star identified from narrowband photometry. Astrophys. J. Lett. 912, L32 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Mardini, M. K., Frebel, A. & Chiti, A. A strontium-rich ultra-metal-poor star in the Atari disc component. Mon. Not. R. Astron. Soc. 529, L60–L66 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Koch, A., McWilliam, A., Grebel, E. K., Zucker, D. B. & Belokurov, V. The highly unusual chemical composition of the Hercules Dwarf Spheroidal Galaxy. Astrophys. J. Lett. 688, L13 (2008).

    Article 
    ADS 

    Google Scholar
     

  • Feltzing, S., Eriksson, K., Kleyna, J. & Wilkinson, M. I. Evidence of enrichment by individual SN from elemental abundance ratios in the very metal-poor dSph galaxy Boötes I. Astron. Astrophys. 508, L1–L4 (2009).

    Article 
    ADS 

    Google Scholar
     

  • Norris, J. E. et al. Chemical enrichment in the faintest galaxies: the carbon and iron abundance spreads in the Boötes I Dwarf Spheroidal Galaxy and the Segue 1 System. Astrophys. J. 723, 1632–1650 (2010).

    Article 
    ADS 

    Google Scholar
     

  • Norris, J. E., Yong, D., Gilmore, G. & Wyse, R. F. G. Boo-1137—an extremely metal-poor star in the ultra-faint dwarf spheroidal galaxy Boötes I. Astrophys. J. 711, 350–360 (2010).

    Article 
    ADS 

    Google Scholar
     

  • Simon, J. D., Frebel, A., McWilliam, A., Kirby, E. N. & Thompson, I. B. High-resolution spectroscopy of extremely metal-poor stars in the least evolved galaxies: Leo IV. Astrophys. J. 716, 446–452 (2010).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A., Simon, J. D., Geha, M. & Willman, B. High-resolution spectroscopy of extremely metal-poor stars in the least evolved galaxies: Ursa Major II and Coma Berenices. Astrophys. J. 708, 560–583 (2010).

    Article 
    ADS 

    Google Scholar
     

  • Lai, D. K. et al. The [Fe/H], [C/Fe], and [α/Fe] distributions of the Boötes I Dwarf Spheroidal Galaxy. Astrophys. J. 738, 51 (2011).

    Article 
    ADS 

    Google Scholar
     

  • Gilmore, G. et al. Elemental abundances and their implications for the chemical enrichment of the Boötes I Ultrafaint Galaxy. Astrophys. J. 763, 61 (2013).

    Article 
    ADS 

    Google Scholar
     

  • Koch, A., Feltzing, S., Adén, D. & Matteucci, F. Neutron-capture element deficiency of the Hercules Dwarf Spheroidal Galaxy. Astron. Astrophys. 554, A5 (2013).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A., Simon, J. D. & Kirby, E. N. Segue 1: an unevolved fossil galaxy from the early universe. Astrophys. J. 786, 74 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Ishigaki, M. N., Aoki, W., Arimoto, N. & Okamoto, S. Chemical compositions of six metal-poor stars in the ultra-faint dwarf spheroidal galaxy Boötes I. Astron. Astrophys. 562, A146 (2014).

    Article 
    ADS 

    Google Scholar
     

  • Koch, A. & Rich, R. M. A chemical confirmation of the faint Boötes II dwarf spheroidal galaxy. Astrophys. J. 794, 89 (2014).

    Article 
    ADS 

    Google Scholar
     

  • François, P. et al. Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies. Astron. Astrophys. 588, A7 (2016).

    Article 

    Google Scholar
     

  • Ji, A. P., Frebel, A., Simon, J. D. & Geha, M. High-resolution spectroscopy of extremely metal-poor stars in the least-evolved galaxies: Bootes II. Astrophys. J. 817, 41 (2016).

    Article 
    ADS 

    Google Scholar
     

  • Frebel, A., Norris, J. E., Gilmore, G. & Wyse, R. F. G. The chemical evolution of the Bootes I ultra-faint dwarf galaxy. Astrophys. J. 826, 110 (2016).

    Article 
    ADS 

    Google Scholar
     

  • Roederer, I. U. et al. Detailed chemical abundances in the r-process-rich ultra-faint dwarf galaxy Reticulum 2. Astron. J. 151, 82 (2016).

    Article 
    ADS 

    Google Scholar
     

  • Hansen, T. T. et al. An r-process enhanced star in the dwarf galaxy Tucana III. Astrophys. J. 838, 44 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Kirby, E. N. et al. Triangulum II. Not especially dense after all. Astrophys. J. 838, 83 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A. et al. Chemical abundances of new member stars in the Tucana II dwarf galaxy. Astrophys. J. 857, 74 (2018).

    Article 
    ADS 

    Google Scholar
     

  • Nagasawa, D. Q. et al. Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I. Astrophys. J. 852, 99 (2018).

    Article 
    ADS 

    Google Scholar
     

  • Spite, M. et al. A CEMP-no star in the ultra-faint dwarf galaxy Pisces II. Astron. Astrophys. 617, A56 (2018).

    Article 

    Google Scholar
     

  • Ji, A. P., Simon, J. D., Frebel, A., Venn, K. A. & Hansen, T. T. Chemical abundances in the ultra-faint dwarf galaxies Grus I and Triangulum II: neutron-capture elements as a defining feature of the faintest dwarfs. Astrophys. J. 870, 83 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Marshall, J. L. et al. Chemical abundance analysis of Tucana III, the second r-process enhanced ultra-faint dwarf galaxy. Astrophys. J. 882, 177 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Hansen, T. T. et al. Chemical analysis of the ultrafaint dwarf galaxy Grus II. Signature of high-mass stellar nucleosynthesis. Astrophys. J. 897, 183 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Waller, F. et al. The Cosmic Hunt for members in the outskirts of ultra-faint dwarf galaxies: Ursa Major I, Coma Berenices, and Boötes I. Mon. Not. R. Astron. Soc. 519, 1349–1365 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Webber, K. B. et al. Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate. Astrophys. J. 959, 141 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Hansen, T. T. et al. Chemical diversity on small scales: abundance analysis of the Tucana V ultrafaint dwarf galaxy. Astrophys. J. 968, 21 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Sestito, F. et al. The pristine inner galaxy survey (PIGS): IX. The largest detailed chemical analysis of very metal-poor stars in the Sagittarius dwarf galaxy. Astron. Astrophys. 689, A201 (2024).

    Article 

    Google Scholar
     

  • Ou, X. et al. Early r-process enrichment and hierarchical assembly across the Sagittarius dwarf galaxy. Astron. J. 169, 279 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Susmitha, A., Koch, A. & Sivarani, T. Abundance analysis of a CEMP-no star in the Carina dwarf spheroidal galaxy. Astron. Astrophys. 606, A112 (2017).

    Article 
    ADS 

    Google Scholar
     

  • Hansen, T. T. et al. Evidence for multiple nucleosynthetic processes from carbon-enhanced metal-poor stars in the Carina dwarf spheroidal galaxy. Astron. Astrophys. 674, A180 (2023).

    Article 

    Google Scholar
     

  • Oh, W. S., Nordlander, T., Da Costa, G. S., Bessell, M. S. & Mackey, A. D. High-resolution spectroscopic study of extremely metal-poor stars in the Large Magellanic Cloud. Mon. Not. R. Astron. Soc. 528, 1065–1080 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Ji, A. P. et al. A nearly pristine star from the Large Magellanic Cloud. Preprint at https://arxiv.org/abs/2509.21643 (2025).

  • Bruce, J. et al. Spectroscopic analysis of Milky Way outer halo satellites: Aquarius II and Boötes II. Astrophys. J. 950, 167 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Cerny, W. et al. Pegasus IV: discovery and spectroscopic confirmation of an ultra-faint dwarf galaxy in the constellation Pegasus. Astrophys. J. 942, 111 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Cerny, W. et al. Discovery and spectroscopic confirmation of Aquarius III: a low-mass Milky Way satellite galaxy. Astrophys. J. 979, 164 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Chiti, A. et al. Magellan/IMACS spectroscopy of Grus I: a low metallicity ultra-faint dwarf galaxy. Astrophys. J. 939, 41 (2022).

    Article 
    ADS 

    Google Scholar
     

  • Fritz, T. K., Carrera, R., Battaglia, G. & Taibi, S. Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC. Astron. Astrophys. 623, A129 (2019).

    Article 
    ADS 

    Google Scholar
     

  • Heiger, M. E. et al. Reading between the (Spectral) Lines: Magellan/IMACS spectroscopy of the ultrafaint dwarf galaxies Eridanus IV and Centaurus I. Astrophys. J. 961, 234 (2024).

    Article 
    ADS 

    Google Scholar
     

  • Jenkins, S. A. et al. Very large telescope spectroscopy of ultra-faint dwarf galaxies. I. Boötes I, Leo IV, and Leo V. Astrophys. J. 920, 92 (2021).

    Article 
    ADS 

    Google Scholar
     

  • Simon, J. D. et al. Birds of a Feather? Magellan/IMACS spectroscopy of the ultra-faint satellites Grus II, Tucana IV, and Tucana V. Astrophys. J. 892, 137 (2020).

    Article 
    ADS 

    Google Scholar
     

  • Smith, S. E. T. et al. Discovery of a new local group dwarf galaxy candidate in UNIONS: Boötes V. Astron. J. 166, 76 (2023).

    Article 
    ADS 

    Google Scholar
     

  • Tan, C. Y. et al. A pride of satellites in the constellation Leo? Discovery of the Leo VI Milky Way satellite ultra-faint dwarf galaxy with DELVE Early Data Release 3. Astrophys. J. 979, 176 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Pace, A. B. The Local Volume Database: a library of the observed properties of nearby dwarf galaxies and star clusters. Open J. Astrophys. 8, 142 (2025).

    Article 
    ADS 

    Google Scholar
     

  • Yoon, J. et al. Observational constraints on first-star nucleosynthesis. I. Evidence for multiple progenitors of CEMP-no stars. Astrophys. J. 833, 20 (2016).

    Article 
    ADS 

    Google Scholar