{"paper":{"title":"Magnetic field and unstable accretion during AM Herculis low states","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2)DAEC, 3), (3)Universit\\'e Denis Diderot, (4)Crimean Astrophysical Observatory, (5)Special Astrophysical Observatory, (6)Department of Astronomy Odessa University, (7)Osservatorio Astronomico di Capodimonte, (8)Institute of Astronomy Bulgaria), CE Saclay, D. de Martino(7), DSM/DAPNIA/SAp, I.L. Andronov(6), J.M. Bonnet-Bidaud (1), M. Mouchet (2, N.M. Shakhovskoy (4), N.N. Somov(5), Observatoire de Paris Section de Meudon, S.V. Kolesnikov(6), T.A. Somova(5), Z. Kraicheva(8) ((1)Service d'Astrophysique","submitted_at":"2000-01-24T19:05:21Z","abstract_excerpt":"A study of AM Her low states in September 1990 and 1991 and June-July 1997 is reported from a coordinated campaign with observations obtained at the Haute-Provence observatory, at the 6-m telescope of the Special Astrophysical Observatory and at the 2.6m and 1.25m telescopes of the Crimean observatory. Spectra obtained at different dates when the source was in low states at a comparable V magnitude, show the presence of strong Zeeman absorption features and marked changes in emission lines with a day-to-day reappearance of the HeII (4686\\AA) emission lines in 1991. Despite this variability, th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0001416","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"}