{"paper":{"title":"Atmospheric parameters and chemical abundances of young stars with APOGEE. I. Orion star-forming region","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. Roman-Lopes, B\\'arbara Rojas-Ayala, Carlos G. Rom\\'an-Z\\'u\\~niga, Edilberto S\\'anchez, Eduardo Zagala Lagunas, Guy S. Stringfellow, Itzarel Herrn\\'andez-Aburto, Javier Serna, J. E. M\\'endez-Delgado, Jes\\'us Hern\\'andez, Jinyoung Serena Kim, Jonathan C. Tan, Jos\\'e G. Fern\\'andez-Trincado, Keivan G. Stassun, Leticia Carigi, Luc\\'ia Adame, Marina Kounkel, Rakesh Pandey, Ricardo L\\'opez-Valdivia, Richard R. Lane, Sandro Villanova, S. J. Wolk","submitted_at":"2025-08-27T23:02:33Z","abstract_excerpt":"We derive atmospheric parameters and chemical abundances in young G-, K-, and M-type stars (temperatures between 6500 and 3100 K) using infrared APOGEE-2 spectra. Atmospheric parameters were determined for 548 young stars in the Orion complex (Orion A, B, OB1, and $\\lambda$ Ori) using the TONALLI code. For 340 slow rotators v sini $\\leq$ 30 km s$^{-1}$), we derived C, Mg, Si, K, Ti, and Fe abundances using 19 atomic lines, MARCS model atmospheres, and BACCHUS. To mitigate the impact of circumstellar material, we excluded stars with infrared excess identified via 2MASS and WISE photometry. We f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.20313","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2508.20313/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}