{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:EKKQ75MMXXGA5O5VCSC7FVEWAJ","short_pith_number":"pith:EKKQ75MM","canonical_record":{"source":{"id":"0801.2245","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-15T10:02:00Z","cross_cats_sorted":[],"title_canon_sha256":"4a0c87bae278d39bb9c43cd8b9d7213695043817b075e1cbd990990b15c777f0","abstract_canon_sha256":"2c6f2873db6918a76f811e8e8a6ebf92815c8b6851615c5318862d54d9e70083"},"schema_version":"1.0"},"canonical_sha256":"22950ff58cbdcc0ebbb51485f2d49602473af291c3fc3402d00b5e0dfdb3dc77","source":{"kind":"arxiv","id":"0801.2245","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0801.2245","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"arxiv_version","alias_value":"0801.2245v1","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0801.2245","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_12","alias_value":"EKKQ75MMXXGA","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_16","alias_value":"EKKQ75MMXXGA5O5V","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_8","alias_value":"EKKQ75MM","created_at":"2026-07-04T17:08:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:EKKQ75MMXXGA5O5VCSC7FVEWAJ","target":"record","payload":{"canonical_record":{"source":{"id":"0801.2245","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-15T10:02:00Z","cross_cats_sorted":[],"title_canon_sha256":"4a0c87bae278d39bb9c43cd8b9d7213695043817b075e1cbd990990b15c777f0","abstract_canon_sha256":"2c6f2873db6918a76f811e8e8a6ebf92815c8b6851615c5318862d54d9e70083"},"schema_version":"1.0"},"canonical_sha256":"22950ff58cbdcc0ebbb51485f2d49602473af291c3fc3402d00b5e0dfdb3dc77","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:08:28.882640Z","signature_b64":"PDX1gqFlZVoTSIQ2AOiCViKJC1O/tywZRd7iYVCrols2j4pTb5Viu4o7xnpP2J92VNXlArMe1z4AELQ7s10gBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"22950ff58cbdcc0ebbb51485f2d49602473af291c3fc3402d00b5e0dfdb3dc77","last_reissued_at":"2026-07-04T17:08:28.882258Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:08:28.882258Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0801.2245","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":"2026-07-04T17:08:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dX7QNZymILdavKOPBVAazaTu2jq2XgzwkUK1vbVigr0CpJZ8BzzDjBXFxys0USRitUtr5Jq8PPhovKfvbcNNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:43:52.174214Z"},"content_sha256":"ed4a57c0cd3083ece78fdf5c9bbef0ecdd0613aec56e0cb9745e59c0b7121477","schema_version":"1.0","event_id":"sha256:ed4a57c0cd3083ece78fdf5c9bbef0ecdd0613aec56e0cb9745e59c0b7121477"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:EKKQ75MMXXGA5O5VCSC7FVEWAJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Isotopic anomaly and stratification of Ca in magnetic Ap stars","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"O. Kochukhov, S. Bagnulo, T. Ryabchikova","submitted_at":"2008-01-15T10:02:00Z","abstract_excerpt":"We have carried out an accurate investigation of the Ca isotopic composition and stratification in the atmospheres of 23 magnetic chemically peculiar (Ap) stars of different temperature and magnetic field strength. With the UVES spectrograph at the 8m ESO VLT, we have obtained high-resolution spectra of Ap stars in the wavelength range 3000-10000 A. Using a detailed spectrum synthesis calculations, we have reproduced a variety of Ca lines in the optical and ultraviolet spectral regions, inferring the overall vertical distribution of Ca abundance, then we have deduced the relative isotopic comp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.2245","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0801.2245/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T17:08:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"usIjkow3hhaSi99a8qfbTV+t118OHqkJ/UNfqTRmFGUvLQJVVatdkqagJnN1O/WiDeqgEJAs7uRcP6+QtiI7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:43:52.174701Z"},"content_sha256":"3d75d4adf9de27e68bb17b9ac8faf2957c8774d804b6e400a2d1c85a17e1bdaa","schema_version":"1.0","event_id":"sha256:3d75d4adf9de27e68bb17b9ac8faf2957c8774d804b6e400a2d1c85a17e1bdaa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/bundle.json","state_url":"https://pith.science/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/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":"2026-08-06T11:43:52Z","links":{"resolver":"https://pith.science/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ","bundle":"https://pith.science/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/bundle.json","state":"https://pith.science/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EKKQ75MMXXGA5O5VCSC7FVEWAJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:EKKQ75MMXXGA5O5VCSC7FVEWAJ","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":"2c6f2873db6918a76f811e8e8a6ebf92815c8b6851615c5318862d54d9e70083","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-15T10:02:00Z","title_canon_sha256":"4a0c87bae278d39bb9c43cd8b9d7213695043817b075e1cbd990990b15c777f0"},"schema_version":"1.0","source":{"id":"0801.2245","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0801.2245","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"arxiv_version","alias_value":"0801.2245v1","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0801.2245","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_12","alias_value":"EKKQ75MMXXGA","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_16","alias_value":"EKKQ75MMXXGA5O5V","created_at":"2026-07-04T17:08:28Z"},{"alias_kind":"pith_short_8","alias_value":"EKKQ75MM","created_at":"2026-07-04T17:08:28Z"}],"graph_snapshots":[{"event_id":"sha256:3d75d4adf9de27e68bb17b9ac8faf2957c8774d804b6e400a2d1c85a17e1bdaa","target":"graph","created_at":"2026-07-04T17:08:28Z","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/0801.2245/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have carried out an accurate investigation of the Ca isotopic composition and stratification in the atmospheres of 23 magnetic chemically peculiar (Ap) stars of different temperature and magnetic field strength. With the UVES spectrograph at the 8m ESO VLT, we have obtained high-resolution spectra of Ap stars in the wavelength range 3000-10000 A. Using a detailed spectrum synthesis calculations, we have reproduced a variety of Ca lines in the optical and ultraviolet spectral regions, inferring the overall vertical distribution of Ca abundance, then we have deduced the relative isotopic comp","authors_text":"O. Kochukhov, S. Bagnulo, T. Ryabchikova","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2008-01-15T10:02:00Z","title":"Isotopic anomaly and stratification of Ca in magnetic Ap stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0801.2245","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:ed4a57c0cd3083ece78fdf5c9bbef0ecdd0613aec56e0cb9745e59c0b7121477","target":"record","created_at":"2026-07-04T17:08:28Z","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":"2c6f2873db6918a76f811e8e8a6ebf92815c8b6851615c5318862d54d9e70083","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2008-01-15T10:02:00Z","title_canon_sha256":"4a0c87bae278d39bb9c43cd8b9d7213695043817b075e1cbd990990b15c777f0"},"schema_version":"1.0","source":{"id":"0801.2245","kind":"arxiv","version":1}},"canonical_sha256":"22950ff58cbdcc0ebbb51485f2d49602473af291c3fc3402d00b5e0dfdb3dc77","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"22950ff58cbdcc0ebbb51485f2d49602473af291c3fc3402d00b5e0dfdb3dc77","first_computed_at":"2026-07-04T17:08:28.882258Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:08:28.882258Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PDX1gqFlZVoTSIQ2AOiCViKJC1O/tywZRd7iYVCrols2j4pTb5Viu4o7xnpP2J92VNXlArMe1z4AELQ7s10gBA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:08:28.882640Z","signed_message":"canonical_sha256_bytes"},"source_id":"0801.2245","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ed4a57c0cd3083ece78fdf5c9bbef0ecdd0613aec56e0cb9745e59c0b7121477","sha256:3d75d4adf9de27e68bb17b9ac8faf2957c8774d804b6e400a2d1c85a17e1bdaa"],"state_sha256":"6ab12459141289e9c66d5124685999a8ee38775e95f4b950f23c6089d717df77"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"foUk7ByFPGRk3tbIUQEKtXTjbpM59cP/j/3fo4ekm51ukS6amU5p5ySwoygAW7Df3/jKrvNjhy43iXUs18jcBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T11:43:52.178767Z","bundle_sha256":"f3c9422702506079c0cd02fa1566f7078a37bf81571a04d07f557187dd69a406"}}