{"paper":{"title":"The dependence of oxygen and nitrogen abundances on stellar mass from the CALIFA survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A.R. L\\'opez-S\\'anchez, B. Husemann, B. Ziegler, C.J. Walcher, C. Kehrig, D. Bomans, E. P\\'erez, E. P\\'erez-Montero, F.F. Rosales-Ortega, J. Bland-Hawthorn, J. Iglesias-P\\'armao, J. Masegosa, J.M. V\\'ilchez, L. Galbany, M. Moll\\'a, P. S\\'anchez-Bl\\'azquez, R.A. Marino, R. Garc\\'ia-Benito, R.M. Gonz\\'alez Delgado, S. Duarte Puertas, S.F. S\\'anchez, the CALIFA collaboration, Y. Ascas\\'ibar","submitted_at":"2016-08-16T17:25:31Z","abstract_excerpt":"We analysed the optical spectra of HII regions extracted from a sample of 350 galaxies of the CALIFA survey. We calculated total O/H abundances and, for the first time, N/O ratios using the semi-empirical routine HII-CHI-mistry, which, according to P\\'erez-Montero (2014), is consistent with the direct method and reduces the uncertainty in the O/H derivation using [NII] lines owing to the dispersion in the O/H-N/O relation. Then we performed linear fittings to the abundances as a function of the de-projected galactocentric distances. The analysis of the radial distribution both for O/H and N/O "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.04677","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"}