{"paper":{"title":"PNe and H II regions in the starburst irregular galaxy NGC 4449 from LBT MODS data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, (3) Zentrum fuer Astronomie der Universit\\\"at Heidelberg, (4) Space Telescope Science Institute), A. Aloisi (4) ((1) INAF-Osservatorio Astronomico di Bologna, A. Buzzoni (1), A. Marchetti (2), A. Pasquali (3), D. Romano (1), F. Annibali (1), F. Cusano (1), M. Fumana (2), M.Mignoli (1), M. Tosi (1)","submitted_at":"2017-06-07T09:53:19Z","abstract_excerpt":"We present deep 3500$-$10000 $\\AA$ spectra of H II regions and planetary nebulae (PNe) in the starburst irregular galaxy NGC 4449, acquired with the Multi Object Double Spectrograph at the Large Binocular Telescope. Using the \"direct\" method, we derived the abundance of He, N, O, Ne, Ar, and S in six H II regions and in four PNe in NGC 4449. This is the first case of PNe studied in a starburst irregular outside the Local Group. Our H II region and PN sample extends over a galacto-centric distance range of $\\approx$2 kpc and spans $\\approx$0.2 dex in oxygen abundance, with average values of $12"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.02108","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"}