{"paper":{"title":"Chemical Abundance Analysis of Three $\\alpha$-Poor, Metal-Poor Stars in the Ultra-Faint Dwarf Galaxy Horologium I","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. Benoit-L\\'evy, A. B. Pace, A. Carnero Rosell, A. Drlica-Wagner, A. Roodman, A. R. Walker, B. Flaugher, B. Nord, B. Santiago, B. Yanny, C. B. D'Andrea, C. Davis, C. E. Cunha, C. M. Pellegrino, D. Brooks, D. Gruen, D. J. James, D. L. DePoy, D. L. Tucker, D. Q. Nagasawa, D. Thomas, D. W. Gerdes, E. Balbinot, E. Bertin, E. Gaztanaga, E. Krause, E. Sanchez, E. Suchyta, F. B. Abdalla, F. Sobreira, G. Gutierrez, G. Tarle, I. Sevilla-Noarbe, J. Annis, J. Carretero, J. D. Simon, J. Frieman, J. Garc\\'ia-Bellido, J. Gschwend, J. L. Marshall, K. Bechtol, K. Honscheid, K. Kuehn, L. E. Strigari, L. N. da Costa, M. Carrasco Kind, M. March, M. Schubnell, M. Smith, M. Soares-Santos, N. B. Suntzeff, N. Kuropatkin, P. Doel, P. Fosalba, R. A. Bernstein, R. A. Gruendl, R. C. Smith, R. C. Wolf, R. H. Wechsler, R. Miquel, R. Schindler, S. Allam, S. Desai, S. Kuhlmann, T. F. Eifler, T. Jeltema, T. M. C. Abbott, T. S. Li, T. T. Hansen, V. Scarpine, W. G. Hartley","submitted_at":"2017-08-07T20:05:00Z","abstract_excerpt":"We present chemical abundance measurements of three stars in the ultra-faint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high resolution spectroscopic observations we measure the metallicity of the three stars as well as abundance ratios of several $\\alpha$-elements, iron-peak elements, and neutron-capture elements. The abundance pattern is relatively consistent among all three stars, which have a low average metallicity of [Fe/H] $\\sim -2.6$ and are not $\\alpha$-enhanced ([$\\alpha$/Fe] $\\sim 0.0$). This result is unexpected when compared to oth"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.02290","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}