{"paper":{"title":"WR20a: a massive cornerstone binary system comprising two extreme early-type stars","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"E. Gosset, G. Rauw, H. Sana, J.-M. Vreux, K.A. van der Hucht, M. De Becker, P.A. Crowther, P.M. Williams, Y. Naze","submitted_at":"2004-04-28T08:02:06Z","abstract_excerpt":"We analyse spectroscopic observations of WR20a revealing that this star is a massive early-type binary system with a most probable orbital period of \\sim 3.675 days. Our spectra indicate that both components are most likely of WN6ha or O3If^*/WN6ha spectral type. The orbital solution for a period of 3.675 days yields extremely large minimum masses of 70.7 \\pm 4.0 and 68.8 \\pm 3.8 M_{\\odot} for the two stars. These properties make WR20a a cornerstone system for the study of massive star evolution."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0404551","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/astro-ph/0404551/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"}