{"paper":{"title":"C and N abundances of MS and SGB stars in NGC 1851","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"(2) Istituto de Astrof\\`i sica de Canarias, 3), (3) Department of Astrophysics, (4) Max-Planck-Institut f\\\"ur Astrophysik, (5) INAF-Osservatorio Astronomico di Bologna, 6), (6) Pontificia Universidad Cat\\'olica de Chile, (7) ESO, A. F. Marino (4), A. Mucciarelli (1), A. P. Milone (2, Bologna, Chile, C. Lardo (1), Departamento da Astronom\\'ia y Astrof\\'isica, E. Pancino (5), Garching b. M\\\"unchen, Germany, Germany.), Italy, La Laguna, M. Rejkuba (7), M. Zoccali (5, O. Gonzalez (7) ((1) Department of Astronomy, R. Carrera (2, Santiago, Spain, Tenerife, University of Bologna, University of La Laguna","submitted_at":"2012-02-28T10:45:45Z","abstract_excerpt":"We present the first chemical analysis of stars on the double subgiant branch (SGB) of the globular cluster NGC 1851. We obtained 48 Magellan IMACS spectra of subgiants and fainter stars covering the spectral region between 3650-6750\\AA, to derive C and N abundances from the spectral features at 4300\\AA (G-band) and at ~ 3883\\AA (CN). We added to our sample ~ 45 unvevolved stars previously observed with FORS2 at the VLT. These two datasets were homogeneously reduced and analyzed. We derived abundances of C and N for a total of 64 stars and found considerable star-to-star variations in both [C/"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.6176","kind":"arxiv","version":2},"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"}