{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:TSFAKI7Z4JCK7AEWKQOFVL35HL","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":"5af389033a8953f6c817f71fd1edbbe8114029bfa4ebdbf3bc92fb3dbaa0a0a0","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-11-03T09:26:24Z","title_canon_sha256":"10aee702d9ec25a3eccbf03894b3fb3b44a0c106ca5e20c6f0b4a2a9cc586908"},"schema_version":"1.0","source":{"id":"astro-ph/0111062","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0111062","created_at":"2026-07-04T16:24:24Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0111062v3","created_at":"2026-07-04T16:24:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0111062","created_at":"2026-07-04T16:24:24Z"},{"alias_kind":"pith_short_12","alias_value":"TSFAKI7Z4JCK","created_at":"2026-07-04T16:24:24Z"},{"alias_kind":"pith_short_16","alias_value":"TSFAKI7Z4JCK7AEW","created_at":"2026-07-04T16:24:24Z"},{"alias_kind":"pith_short_8","alias_value":"TSFAKI7Z","created_at":"2026-07-04T16:24:24Z"}],"graph_snapshots":[{"event_id":"sha256:7bb9c5ee01f0485aca4fa40d583be62810894c4f2b35728fc396c799bbb9c8e2","target":"graph","created_at":"2026-07-04T16:24:24Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0111062/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a spectral analysis of the sdO central star K 648 based on medium-resolution optical and high-resolution UV spectra. The photospheric parameters are determined by means of state-of-the-art NLTE model atmosphere techniques.\n  We found Teff = 39 +/- 2 kK and log g = 3.9 +/- 0.2. The helium (He/H=0.08) and oxygen (O/H=0.001) abundances are about solar while carbon is enriched by a factor of 2.5 (C/H=0.001). Nitrogen (N/H = 10**(-6), [N/H] = -2.0) appears at a sub-solar value. However, these metal abundances are much higher than the cluster's metallicity M 15: [Fe/H] = -2.25).\n  The sur","authors_text":"K. Werner, T. Rauch, U. Heber","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2001-11-03T09:26:24Z","title":"Spectral analysis of the sdO K 648, the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 (NGC 7078)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0111062","kind":"arxiv","version":3},"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":"sha256:7930a861548a1e33b4f5eb285b2e2da84a3d024abf156657c406024325abf7d2","target":"record","created_at":"2026-07-04T16:24:24Z","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":"5af389033a8953f6c817f71fd1edbbe8114029bfa4ebdbf3bc92fb3dbaa0a0a0","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2001-11-03T09:26:24Z","title_canon_sha256":"10aee702d9ec25a3eccbf03894b3fb3b44a0c106ca5e20c6f0b4a2a9cc586908"},"schema_version":"1.0","source":{"id":"astro-ph/0111062","kind":"arxiv","version":3}},"canonical_sha256":"9c8a0523f9e244af8096541c5aaf7d3aeefe9a260a58a57e8aea65019a09de36","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9c8a0523f9e244af8096541c5aaf7d3aeefe9a260a58a57e8aea65019a09de36","first_computed_at":"2026-07-04T16:24:24.487202Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:24:24.487202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VdLtbDftTsUgsgrNM5csD8fIlteW4PNadEV6BIjvVZkbMNk7Ck/IGKPfhBERXTPwU/ymhrtLcZsudkAg4fdKCw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:24:24.487636Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0111062","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7930a861548a1e33b4f5eb285b2e2da84a3d024abf156657c406024325abf7d2","sha256:7bb9c5ee01f0485aca4fa40d583be62810894c4f2b35728fc396c799bbb9c8e2"],"state_sha256":"dd9ce7fb04e9a5a91d80d444fae27727f479619f1385048a29e6fd38aeae5b6d"}