{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IBI3QJURB5R3O6UBF2GF626SL5","short_pith_number":"pith:IBI3QJUR","canonical_record":{"source":{"id":"1804.08255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T06:32:31Z","cross_cats_sorted":[],"title_canon_sha256":"2c6b1ef08e88cb0fcbeb67d846ddd2a09965480ffca315d033bf7f4ca4d5ef59","abstract_canon_sha256":"dcdf9b6af1b762ceea805fcbe51dbd6eea5a19a69f719eec6bbb44b5e01db1cd"},"schema_version":"1.0"},"canonical_sha256":"4051b826910f63b77a812e8c5f6bd25f5c6596dacad9f9b054a8e5949472d761","source":{"kind":"arxiv","id":"1804.08255","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.08255","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"arxiv_version","alias_value":"1804.08255v1","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.08255","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"pith_short_12","alias_value":"IBI3QJURB5R3","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IBI3QJURB5R3O6UB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IBI3QJUR","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IBI3QJURB5R3O6UBF2GF626SL5","target":"record","payload":{"canonical_record":{"source":{"id":"1804.08255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T06:32:31Z","cross_cats_sorted":[],"title_canon_sha256":"2c6b1ef08e88cb0fcbeb67d846ddd2a09965480ffca315d033bf7f4ca4d5ef59","abstract_canon_sha256":"dcdf9b6af1b762ceea805fcbe51dbd6eea5a19a69f719eec6bbb44b5e01db1cd"},"schema_version":"1.0"},"canonical_sha256":"4051b826910f63b77a812e8c5f6bd25f5c6596dacad9f9b054a8e5949472d761","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:35.146527Z","signature_b64":"wXj5JiwmYZQJ61BQ0xTDTmzJ5XX3TUyA93C5GsowH31ENE13rgQfHYlmv0SbyalET/pg0bXedPbxfkKa7Ot2CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4051b826910f63b77a812e8c5f6bd25f5c6596dacad9f9b054a8e5949472d761","last_reissued_at":"2026-05-18T00:02:35.145908Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:35.145908Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.08255","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":"2026-05-18T00:02:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ixee2rSAq91d7cZEFOOn3UxrwYAjCM074YhYHQvEF7hFV28DguNnz6vY9gm8aZigQRhajdKzZadkzvFupj3AAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:28:10.794232Z"},"content_sha256":"3586ceaea21b746c667bc4eb88c67840e661ce5f0fac16912f10308af1dad6e6","schema_version":"1.0","event_id":"sha256:3586ceaea21b746c667bc4eb88c67840e661ce5f0fac16912f10308af1dad6e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IBI3QJURB5R3O6UBF2GF626SL5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The solar-like \"Second Spectrum\" and the polarised metal lines in emission of the post-AGB binary 89 Herculis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Ghedina, C. Scalia, F. Leone, M. Cecconi, M. Gangi, M. Giarrusso, M. Munari, R. Cosentino, S. Scuderi","submitted_at":"2018-04-23T06:32:31Z","abstract_excerpt":"We studied the polarised spectrum of the post-AGB binary system 89\\,Herculis on the basis of data collected with the high resolution \\emph{Catania Astrophysical Observatory Spectropolarimeter}, \\emph{HArps-North POlarimeter} and \\emph{Echelle SpectroPolarimetric Device for the Observation of Stars}. We find the existence of linear polarisation in the strongest metal lines in absorption and with low excitation potentials. Signals are characterized by complex Q and U morphologies varying with the orbital period. As possible origin of this \"Second Solar Spectrum\"-like behaviour, we rule out magne"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08255","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":"2026-05-18T00:02:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xC08DkPS2rY8Y1/lD/7zTWAVHHbI7BsnSKc4JQJ6dArzx+r6EvBW5tI452QftCIPCx4fIQmziftoH5qIQmWXBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:28:10.794615Z"},"content_sha256":"8fd676ef22eeae834935fccf7544e69d9f4c6fbf9b15b9e297d2491c0d484a89","schema_version":"1.0","event_id":"sha256:8fd676ef22eeae834935fccf7544e69d9f4c6fbf9b15b9e297d2491c0d484a89"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IBI3QJURB5R3O6UBF2GF626SL5/bundle.json","state_url":"https://pith.science/pith/IBI3QJURB5R3O6UBF2GF626SL5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IBI3QJURB5R3O6UBF2GF626SL5/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":"2026-05-19T16:28:10Z","links":{"resolver":"https://pith.science/pith/IBI3QJURB5R3O6UBF2GF626SL5","bundle":"https://pith.science/pith/IBI3QJURB5R3O6UBF2GF626SL5/bundle.json","state":"https://pith.science/pith/IBI3QJURB5R3O6UBF2GF626SL5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IBI3QJURB5R3O6UBF2GF626SL5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IBI3QJURB5R3O6UBF2GF626SL5","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":"dcdf9b6af1b762ceea805fcbe51dbd6eea5a19a69f719eec6bbb44b5e01db1cd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T06:32:31Z","title_canon_sha256":"2c6b1ef08e88cb0fcbeb67d846ddd2a09965480ffca315d033bf7f4ca4d5ef59"},"schema_version":"1.0","source":{"id":"1804.08255","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.08255","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"arxiv_version","alias_value":"1804.08255v1","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.08255","created_at":"2026-05-18T00:02:35Z"},{"alias_kind":"pith_short_12","alias_value":"IBI3QJURB5R3","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IBI3QJURB5R3O6UB","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IBI3QJUR","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:8fd676ef22eeae834935fccf7544e69d9f4c6fbf9b15b9e297d2491c0d484a89","target":"graph","created_at":"2026-05-18T00:02:35Z","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 studied the polarised spectrum of the post-AGB binary system 89\\,Herculis on the basis of data collected with the high resolution \\emph{Catania Astrophysical Observatory Spectropolarimeter}, \\emph{HArps-North POlarimeter} and \\emph{Echelle SpectroPolarimetric Device for the Observation of Stars}. We find the existence of linear polarisation in the strongest metal lines in absorption and with low excitation potentials. Signals are characterized by complex Q and U morphologies varying with the orbital period. As possible origin of this \"Second Solar Spectrum\"-like behaviour, we rule out magne","authors_text":"A. Ghedina, C. Scalia, F. Leone, M. Cecconi, M. Gangi, M. Giarrusso, M. Munari, R. Cosentino, S. Scuderi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T06:32:31Z","title":"The solar-like \"Second Spectrum\" and the polarised metal lines in emission of the post-AGB binary 89 Herculis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08255","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":"sha256:3586ceaea21b746c667bc4eb88c67840e661ce5f0fac16912f10308af1dad6e6","target":"record","created_at":"2026-05-18T00:02:35Z","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":"dcdf9b6af1b762ceea805fcbe51dbd6eea5a19a69f719eec6bbb44b5e01db1cd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-23T06:32:31Z","title_canon_sha256":"2c6b1ef08e88cb0fcbeb67d846ddd2a09965480ffca315d033bf7f4ca4d5ef59"},"schema_version":"1.0","source":{"id":"1804.08255","kind":"arxiv","version":1}},"canonical_sha256":"4051b826910f63b77a812e8c5f6bd25f5c6596dacad9f9b054a8e5949472d761","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4051b826910f63b77a812e8c5f6bd25f5c6596dacad9f9b054a8e5949472d761","first_computed_at":"2026-05-18T00:02:35.145908Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:35.145908Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wXj5JiwmYZQJ61BQ0xTDTmzJ5XX3TUyA93C5GsowH31ENE13rgQfHYlmv0SbyalET/pg0bXedPbxfkKa7Ot2CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:35.146527Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.08255","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3586ceaea21b746c667bc4eb88c67840e661ce5f0fac16912f10308af1dad6e6","sha256:8fd676ef22eeae834935fccf7544e69d9f4c6fbf9b15b9e297d2491c0d484a89"],"state_sha256":"ee190a07eba849f3cdce8d3254fe48a4ddbdde2de52b5c642e5841637aa07f6e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qiwTr1F2qTU3ZCQtwETG2Svb+mUTID+YFGKPlmyoYGTEuesU3uMVi9phcQnC/abPrPh5jLI/tSu0sSsHuEbWDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T16:28:10.796859Z","bundle_sha256":"fa0a72498804c0b6e39b42b0229a9bb9489694a249bb3368a71014d0e7b4e0f8"}}