{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:E5JLFFGQSVGPW5Q3TKD5WUPA6U","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b3c66c0ba7967b2d8a9b1897d423aba2f92d8ef2872ee0abd1b436308699f182","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-04-23T14:18:58Z","title_canon_sha256":"693ff89f3931b2dcbac5aa0d9f2a85ef09359e2c55b15edbc1f7657515742476"},"schema_version":"1.0","source":{"id":"1504.06194","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.06194","created_at":"2026-05-18T02:18:02Z"},{"alias_kind":"arxiv_version","alias_value":"1504.06194v1","created_at":"2026-05-18T02:18:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.06194","created_at":"2026-05-18T02:18:02Z"},{"alias_kind":"pith_short_12","alias_value":"E5JLFFGQSVGP","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"E5JLFFGQSVGPW5Q3","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"E5JLFFGQ","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:7e3222eab94491fbae6cf9dbf924aa3c243e0a1338c8c984440b3479ccf9512e","target":"graph","created_at":"2026-05-18T02:18:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Massive stars burn hydrogen through the CNO cycle during most of their evolution. When mixing is efficient, or when mass transfer in binary systems happens, chemically processed material is observed at the surface of O and B stars. ON stars show stronger lines of nitrogen than morphologically normal counterparts. Whether this corresponds to the presence of material processed through the CNO cycle or not is not known. Our goal is to answer this question. We perform a spectroscopic analysis of a sample of ON stars with atmosphere models. We determine the fundamental parameters as well as the He,","authors_text":"(2) IAC, 3), (3) La Laguna University, (4) University College London, (5) Keele University, (6) Space Telescope Science Institute, (7) LAM, (8) La Serena University), A. Palacios (1), C. Georgy (5), CNRS & Aix-Marseille University, CNRS & Montpellier University, F. Martins (1), I. Howarth (4), J.-C. Bouret (7), N.R. Walborn (6), R. Barba (8) ((1) LUPM, S. Simon-Diaz (2","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-04-23T14:18:58Z","title":"Surface abundances of ON stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.06194","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:d61490e0b7eb696301bdd74b7e8419fe27ef42e63d66a19fff7437b78d807c0a","target":"record","created_at":"2026-05-18T02:18:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b3c66c0ba7967b2d8a9b1897d423aba2f92d8ef2872ee0abd1b436308699f182","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-04-23T14:18:58Z","title_canon_sha256":"693ff89f3931b2dcbac5aa0d9f2a85ef09359e2c55b15edbc1f7657515742476"},"schema_version":"1.0","source":{"id":"1504.06194","kind":"arxiv","version":1}},"canonical_sha256":"2752b294d0954cfb761b9a87db51e0f5030e5ad980d8fbb84ce48944fe544ba9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2752b294d0954cfb761b9a87db51e0f5030e5ad980d8fbb84ce48944fe544ba9","first_computed_at":"2026-05-18T02:18:02.295812Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:18:02.295812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I680m8sAsT4dPQht7Clm3Uq3LVBS7JK3bimOhD3y5RTFoRIHMcBFtrsSlhcIQh/Mh6Ydvegz457Qa7smPgIFAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:18:02.296514Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.06194","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d61490e0b7eb696301bdd74b7e8419fe27ef42e63d66a19fff7437b78d807c0a","sha256:7e3222eab94491fbae6cf9dbf924aa3c243e0a1338c8c984440b3479ccf9512e"],"state_sha256":"a915a32174fb896bdf22ac724a1dd32fbcbdc6a5e4567af28053904955843356"}