{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:XLSBJ44OPD7C4D5IMKRCNSMUDB","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":"632d04ca252cef0b8a5e330b893909902421d1954bef57c2ebce9b6678ca165c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-28T15:02:20Z","title_canon_sha256":"696dce498e6bd3a927418320da0bf825a59f8a1297ca73ceca10c7030e943b3b"},"schema_version":"1.0","source":{"id":"1505.07714","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.07714","created_at":"2026-05-18T01:35:54Z"},{"alias_kind":"arxiv_version","alias_value":"1505.07714v1","created_at":"2026-05-18T01:35:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.07714","created_at":"2026-05-18T01:35:54Z"},{"alias_kind":"pith_short_12","alias_value":"XLSBJ44OPD7C","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"XLSBJ44OPD7C4D5I","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"XLSBJ44O","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:29ec7cbc343a816cf0bf29ba8ba37444f98a80ebba53d18fcd8ac7543898059c","target":"graph","created_at":"2026-05-18T01:35:54Z","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":"Probing the structures of stellar winds is of prime importance for the understanding of massive stars. Based on their optical spectral morphology and variability, the stars of the Oef class have been suggested to feature large-scale structures in their wind. High-resolution X-ray spectroscopy and time-series of X-ray observations of presumably-single O-type stars can help us understand the physics of their stellar winds. We have collected XMM-Newton observations and coordinated optical spectroscopy of the O6Ief star lambda Cep to study its X-ray and optical variability and to analyse its high-","authors_text":"A. Hempelmann, A. Herve, E. Gosset, G. Rauw, J.H.M.M. Schmitt, J.M. Uuh-Sonda, J.N. Gonzalez-Perez, K.-P. Schroeder, M. Mittag, P. Eenens, Y. Naze","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-28T15:02:20Z","title":"Simultaneous X-ray and optical spectroscopy of the Oef supergiant lambda Cep"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.07714","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":"sha256:1e0328205052da57eb67b4567a1101cefe4ca7fee76bd23f0b76ac65864eeb92","target":"record","created_at":"2026-05-18T01:35:54Z","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":"632d04ca252cef0b8a5e330b893909902421d1954bef57c2ebce9b6678ca165c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-05-28T15:02:20Z","title_canon_sha256":"696dce498e6bd3a927418320da0bf825a59f8a1297ca73ceca10c7030e943b3b"},"schema_version":"1.0","source":{"id":"1505.07714","kind":"arxiv","version":1}},"canonical_sha256":"bae414f38e78fe2e0fa862a226c9941865be5483b06ba77f4981ccc7250c3eff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bae414f38e78fe2e0fa862a226c9941865be5483b06ba77f4981ccc7250c3eff","first_computed_at":"2026-05-18T01:35:54.331272Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:54.331272Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZcEgJ58lmRNUUFmRAfdHwi2pTRUG0zEWRpvorHOYTpFIR5dZz2UHGS8YRbaPfaZFaMq65B7ADBa/kltVZyB+Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:54.331876Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.07714","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1e0328205052da57eb67b4567a1101cefe4ca7fee76bd23f0b76ac65864eeb92","sha256:29ec7cbc343a816cf0bf29ba8ba37444f98a80ebba53d18fcd8ac7543898059c"],"state_sha256":"a73fe6d0b177246e6170cec08810fc700546aa5abab6734181ef923126709578"}