{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:WNYPJ4HCDMIOUQM5EIVVRZ6CDW","short_pith_number":"pith:WNYPJ4HC","canonical_record":{"source":{"id":"1207.2451","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-10T19:47:25Z","cross_cats_sorted":[],"title_canon_sha256":"583c8c1e5d016522b939a59db8629d755d3a6892d903bf6480bb1a94ac0431e8","abstract_canon_sha256":"f1055e9bb3517a075b92c7937f454889521fedbce2390c11084fd81ad7402409"},"schema_version":"1.0"},"canonical_sha256":"b370f4f0e21b10ea419d222b58e7c21da9513872146e8a0fd5b586d47703ad33","source":{"kind":"arxiv","id":"1207.2451","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2451","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2451v1","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2451","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"pith_short_12","alias_value":"WNYPJ4HCDMIO","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"WNYPJ4HCDMIOUQM5","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"WNYPJ4HC","created_at":"2026-05-18T12:27:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:WNYPJ4HCDMIOUQM5EIVVRZ6CDW","target":"record","payload":{"canonical_record":{"source":{"id":"1207.2451","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-10T19:47:25Z","cross_cats_sorted":[],"title_canon_sha256":"583c8c1e5d016522b939a59db8629d755d3a6892d903bf6480bb1a94ac0431e8","abstract_canon_sha256":"f1055e9bb3517a075b92c7937f454889521fedbce2390c11084fd81ad7402409"},"schema_version":"1.0"},"canonical_sha256":"b370f4f0e21b10ea419d222b58e7c21da9513872146e8a0fd5b586d47703ad33","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:56:25.714187Z","signature_b64":"DbjJlXfGRORtKRi3iSDbZTzSr42lzwHcF0lfOT5ezpclEs28a9g0rpqbJjMtXzhdN+bM2geBDbei9S0MTeX9AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b370f4f0e21b10ea419d222b58e7c21da9513872146e8a0fd5b586d47703ad33","last_reissued_at":"2026-05-18T01:56:25.713444Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:56:25.713444Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.2451","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VbjS+P53Kmm8sYIB9xvyo3aTlNgZEoKqfb9m61dnTcgs4st7yJUgPru8nMkmy8i4GTioTfzT+fzf4qQU0HQnDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:37:31.618521Z"},"content_sha256":"3d8aee8af487c2c7412161e629365f9de100655bdb9aa6e48408b961e5016c5f","schema_version":"1.0","event_id":"sha256:3d8aee8af487c2c7412161e629365f9de100655bdb9aa6e48408b961e5016c5f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:WNYPJ4HCDMIOUQM5EIVVRZ6CDW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"NLTE analysis of Sr lines in spectra of late-type stars with new R-matrix atomic data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"C. J. Hansen, G. Ruchti, M. Bautista, M. Bergemann","submitted_at":"2012-07-10T19:47:25Z","abstract_excerpt":"We investigate statistical equilibrium of neutral and singly-ionized strontium in late-type stellar atmospheres. Particular attention is given to the completeness of the model atom, which includes new energy levels, transition probabilities, photoionization and electron-impact excitation cross-sections computed with the R-matrix method. The NLTE model is applied to the analysis of Sr I and Sr II lines in the spectra of the Sun, Procyon, Arcturus, and HD 122563, showing a significant improvement in the ionization balance compared to LTE line formation calculations, which predict abundance discr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2451","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:56:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D6BOBmABzXLtMfJnRj1tUZC4cVFpyNT9QIYuHPqAj9JL9xO5c2ex60phUBcydJdvjl8RiSpyQ2NzJ13lpeLSCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:37:31.618878Z"},"content_sha256":"0cba46b95d6a15832bcf11ea9493af37d847a4d24eb6b521fbc22b1adcf2dd8a","schema_version":"1.0","event_id":"sha256:0cba46b95d6a15832bcf11ea9493af37d847a4d24eb6b521fbc22b1adcf2dd8a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/bundle.json","state_url":"https://pith.science/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-02T21:37:31Z","links":{"resolver":"https://pith.science/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW","bundle":"https://pith.science/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/bundle.json","state":"https://pith.science/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WNYPJ4HCDMIOUQM5EIVVRZ6CDW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:WNYPJ4HCDMIOUQM5EIVVRZ6CDW","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":"f1055e9bb3517a075b92c7937f454889521fedbce2390c11084fd81ad7402409","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-10T19:47:25Z","title_canon_sha256":"583c8c1e5d016522b939a59db8629d755d3a6892d903bf6480bb1a94ac0431e8"},"schema_version":"1.0","source":{"id":"1207.2451","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2451","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2451v1","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2451","created_at":"2026-05-18T01:56:25Z"},{"alias_kind":"pith_short_12","alias_value":"WNYPJ4HCDMIO","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_16","alias_value":"WNYPJ4HCDMIOUQM5","created_at":"2026-05-18T12:27:25Z"},{"alias_kind":"pith_short_8","alias_value":"WNYPJ4HC","created_at":"2026-05-18T12:27:25Z"}],"graph_snapshots":[{"event_id":"sha256:0cba46b95d6a15832bcf11ea9493af37d847a4d24eb6b521fbc22b1adcf2dd8a","target":"graph","created_at":"2026-05-18T01:56:25Z","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":"We investigate statistical equilibrium of neutral and singly-ionized strontium in late-type stellar atmospheres. Particular attention is given to the completeness of the model atom, which includes new energy levels, transition probabilities, photoionization and electron-impact excitation cross-sections computed with the R-matrix method. The NLTE model is applied to the analysis of Sr I and Sr II lines in the spectra of the Sun, Procyon, Arcturus, and HD 122563, showing a significant improvement in the ionization balance compared to LTE line formation calculations, which predict abundance discr","authors_text":"C. J. Hansen, G. Ruchti, M. Bautista, M. Bergemann","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-10T19:47:25Z","title":"NLTE analysis of Sr lines in spectra of late-type stars with new R-matrix atomic data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2451","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":"sha256:3d8aee8af487c2c7412161e629365f9de100655bdb9aa6e48408b961e5016c5f","target":"record","created_at":"2026-05-18T01:56:25Z","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":"f1055e9bb3517a075b92c7937f454889521fedbce2390c11084fd81ad7402409","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-07-10T19:47:25Z","title_canon_sha256":"583c8c1e5d016522b939a59db8629d755d3a6892d903bf6480bb1a94ac0431e8"},"schema_version":"1.0","source":{"id":"1207.2451","kind":"arxiv","version":1}},"canonical_sha256":"b370f4f0e21b10ea419d222b58e7c21da9513872146e8a0fd5b586d47703ad33","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b370f4f0e21b10ea419d222b58e7c21da9513872146e8a0fd5b586d47703ad33","first_computed_at":"2026-05-18T01:56:25.713444Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:25.713444Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DbjJlXfGRORtKRi3iSDbZTzSr42lzwHcF0lfOT5ezpclEs28a9g0rpqbJjMtXzhdN+bM2geBDbei9S0MTeX9AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:25.714187Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.2451","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d8aee8af487c2c7412161e629365f9de100655bdb9aa6e48408b961e5016c5f","sha256:0cba46b95d6a15832bcf11ea9493af37d847a4d24eb6b521fbc22b1adcf2dd8a"],"state_sha256":"a89634b2afaae5d5d4a50292b4d98684b11973d8434cc5d631bf129781943ae7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F33db7YvfeRVZeOSYAUPcIXhNy6xO/hpNjJZebzI4Fzq50U0XG56RiJ1o/q9/WIc559gxNL56QemiGRmJOiGAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T21:37:31.620837Z","bundle_sha256":"a37fdd13635527cd85a4cb3bd2f3e0a7172c1aa05ad5b3b3bf6e0268ef15207c"}}