{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:7PO5LABBMH6ANWPMGH5WGH473Q","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":"4dd6858398297c646b529889ad1f0663ab4bb175cabc502e391366783749b4c0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-06-16T18:00:55Z","title_canon_sha256":"daade2c8b168340699023d918bd1f2d1d674a0a13002ece55592a79337c67487"},"schema_version":"1.0","source":{"id":"1706.05389","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1706.05389","created_at":"2026-05-18T00:38:02Z"},{"alias_kind":"arxiv_version","alias_value":"1706.05389v1","created_at":"2026-05-18T00:38:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.05389","created_at":"2026-05-18T00:38:02Z"},{"alias_kind":"pith_short_12","alias_value":"7PO5LABBMH6A","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"7PO5LABBMH6ANWPM","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"7PO5LABB","created_at":"2026-05-18T12:31:05Z"}],"graph_snapshots":[{"event_id":"sha256:ea0ababcfb83d903c1c7feb18eb9f59ac046131a5c176064917c3a8c0da749ea","target":"graph","created_at":"2026-05-18T00:38:02Z","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":"Extreme helium stars (EHe stars) are hydrogen-deficient supergiants of spectral type A and B. They are believed to result from mergers in double degenerate systems. In this paper we present a detailed quantitative non-LTE spectral analysis for BD+10$^\\circ$2179, a prototype of this rare class of stars, using UVES and FEROS spectra covering the range from $\\sim$3100 to 10 000 {\\AA}. Atmosphere model computations were improved in two ways. First, since the UV metal line blanketing has a strong impact on the temperature-density stratification, we used the Atlas12 code. Additionally, We tested Atl","authors_text":"((1) California Institute of Technology, (2) Universit\\\"at Innsbruck, (3) University of Erlangen-Nuremberg, (4) Armagh Observatory, (5) University Observatory Munich), C. Simon Jeffery (4), Keith Butler (5), Norbert Przybilla (2), N. T. Behara (4), Planetarium, Thomas Kupfer (1), Ulrich Heber (3)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-06-16T18:00:55Z","title":"Quantitative spectroscopy of extreme helium stars - Model atmospheres and a non-LTE abundance analysis of BD+10$^\\circ$2179?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.05389","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":"sha256:02f3949613a5420487ae9b93e81618319dad79aaac7cbc3729a15b0913ed7b51","target":"record","created_at":"2026-05-18T00:38:02Z","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":"4dd6858398297c646b529889ad1f0663ab4bb175cabc502e391366783749b4c0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-06-16T18:00:55Z","title_canon_sha256":"daade2c8b168340699023d918bd1f2d1d674a0a13002ece55592a79337c67487"},"schema_version":"1.0","source":{"id":"1706.05389","kind":"arxiv","version":1}},"canonical_sha256":"fbddd5802161fc06d9ec31fb631f9fdc1c7f61ca5d1034f80cbc5fa92dfc189d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fbddd5802161fc06d9ec31fb631f9fdc1c7f61ca5d1034f80cbc5fa92dfc189d","first_computed_at":"2026-05-18T00:38:02.169085Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:02.169085Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kviYNveR3EZeu3PAv8WVTEorkuwbHcO4LqXTF268n+Q1Y1XL6wsYWxKuqMwgjCp4LtJw4IkzyuzyQe4tnm8FBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:02.169688Z","signed_message":"canonical_sha256_bytes"},"source_id":"1706.05389","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:02f3949613a5420487ae9b93e81618319dad79aaac7cbc3729a15b0913ed7b51","sha256:ea0ababcfb83d903c1c7feb18eb9f59ac046131a5c176064917c3a8c0da749ea"],"state_sha256":"a1b46529dd2b4cd5c053fa42026035f48e26be3e51bd1a99845320fb0b89de1f"}