{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:ASOBBDJSYGO4PEZXWLWG5NZZ4H","short_pith_number":"pith:ASOBBDJS","canonical_record":{"source":{"id":"astro-ph/0703296","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-13T14:43:49Z","cross_cats_sorted":[],"title_canon_sha256":"71e5793530cf452ad04b2a88f82ee38c1762cfd51b589d7461ef12445a17e57e","abstract_canon_sha256":"797be053f3bf9b00351a436690c0911e24e172d24f9ca86f931b8467bd6b888f"},"schema_version":"1.0"},"canonical_sha256":"049c108d32c19dc79337b2ec6eb739e1c404c7af8356e6d81ffa59b98319afdf","source":{"kind":"arxiv","id":"astro-ph/0703296","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703296","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703296v1","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703296","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_12","alias_value":"ASOBBDJSYGO4","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_16","alias_value":"ASOBBDJSYGO4PEZX","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_8","alias_value":"ASOBBDJS","created_at":"2026-07-04T15:00:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:ASOBBDJSYGO4PEZXWLWG5NZZ4H","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0703296","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-13T14:43:49Z","cross_cats_sorted":[],"title_canon_sha256":"71e5793530cf452ad04b2a88f82ee38c1762cfd51b589d7461ef12445a17e57e","abstract_canon_sha256":"797be053f3bf9b00351a436690c0911e24e172d24f9ca86f931b8467bd6b888f"},"schema_version":"1.0"},"canonical_sha256":"049c108d32c19dc79337b2ec6eb739e1c404c7af8356e6d81ffa59b98319afdf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:00:05.442926Z","signature_b64":"KgwK2bIb4PsGbEqlVkjCDBl0X7h9ZMNNbRMxRq2E413NJvE0CXVcKzqU9ZmRz2umBnvoonBRpMH1sUnZLmjdBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"049c108d32c19dc79337b2ec6eb739e1c404c7af8356e6d81ffa59b98319afdf","last_reissued_at":"2026-07-04T15:00:05.442536Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:00:05.442536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0703296","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":"2026-07-04T15:00:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QcJuwuuIdh0RI+j6vIKhcVb+0/GKadbgJBqT+4+0JatL/nU6eG1+UNEIfsebFxndG0FBznf5FjnwY4r1ojs5Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:41:14.722642Z"},"content_sha256":"bb058a1c644adb14da464d35652e33e325e989b49b2c1317aaddd2efc4d2aac1","schema_version":"1.0","event_id":"sha256:bb058a1c644adb14da464d35652e33e325e989b49b2c1317aaddd2efc4d2aac1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:ASOBBDJSYGO4PEZXWLWG5NZZ4H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ca isotopic anomaly in the atmospheres of Ap stars","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"O. Kochukhov, S. Bagnulo, T. Ryabchikova","submitted_at":"2007-03-13T14:43:49Z","abstract_excerpt":"We present results of the Ca stratification analysis in the atmospheres of 21 magnetic chemically peculiar (Ap) stars. This analysis was based on the spectral observations carried out with the UVES spectrograph attached to the 8-m VLT telescope. Ca was found to be strongly stratified in all stars with different effective temperatures and magnetic field strengths. This element is overabundant by 1-1.5 dex below logtau_5000~-1 and strongly depleted above logtau_5000=-1.5. Based on the overall Ca abundance distributions, we modelled a profile of the IR-triplet Ca II 8498 line. It shows a signific"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703296","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/astro-ph/0703296/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":"2026-07-04T15:00:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7xZjIjJK7cyarJ0DdJFm9Q0b7RHYwdQhF9Ny9JYjQY2nNzZ1n4DprcorOFWlRrQyK/viozC7+6x02z8JGSWMCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:41:14.723241Z"},"content_sha256":"85b4bfe4046f7995141a7b8b48125bab53ff9b26bc408c826391b479001e8559","schema_version":"1.0","event_id":"sha256:85b4bfe4046f7995141a7b8b48125bab53ff9b26bc408c826391b479001e8559"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/bundle.json","state_url":"https://pith.science/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/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":"2026-08-06T11:41:14Z","links":{"resolver":"https://pith.science/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H","bundle":"https://pith.science/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/bundle.json","state":"https://pith.science/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ASOBBDJSYGO4PEZXWLWG5NZZ4H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:ASOBBDJSYGO4PEZXWLWG5NZZ4H","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":"797be053f3bf9b00351a436690c0911e24e172d24f9ca86f931b8467bd6b888f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-13T14:43:49Z","title_canon_sha256":"71e5793530cf452ad04b2a88f82ee38c1762cfd51b589d7461ef12445a17e57e"},"schema_version":"1.0","source":{"id":"astro-ph/0703296","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703296","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703296v1","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703296","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_12","alias_value":"ASOBBDJSYGO4","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_16","alias_value":"ASOBBDJSYGO4PEZX","created_at":"2026-07-04T15:00:05Z"},{"alias_kind":"pith_short_8","alias_value":"ASOBBDJS","created_at":"2026-07-04T15:00:05Z"}],"graph_snapshots":[{"event_id":"sha256:85b4bfe4046f7995141a7b8b48125bab53ff9b26bc408c826391b479001e8559","target":"graph","created_at":"2026-07-04T15:00:05Z","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/0703296/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present results of the Ca stratification analysis in the atmospheres of 21 magnetic chemically peculiar (Ap) stars. This analysis was based on the spectral observations carried out with the UVES spectrograph attached to the 8-m VLT telescope. Ca was found to be strongly stratified in all stars with different effective temperatures and magnetic field strengths. This element is overabundant by 1-1.5 dex below logtau_5000~-1 and strongly depleted above logtau_5000=-1.5. Based on the overall Ca abundance distributions, we modelled a profile of the IR-triplet Ca II 8498 line. It shows a signific","authors_text":"O. Kochukhov, S. Bagnulo, T. Ryabchikova","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-03-13T14:43:49Z","title":"Ca isotopic anomaly in the atmospheres of Ap stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703296","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:bb058a1c644adb14da464d35652e33e325e989b49b2c1317aaddd2efc4d2aac1","target":"record","created_at":"2026-07-04T15:00:05Z","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":"797be053f3bf9b00351a436690c0911e24e172d24f9ca86f931b8467bd6b888f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-13T14:43:49Z","title_canon_sha256":"71e5793530cf452ad04b2a88f82ee38c1762cfd51b589d7461ef12445a17e57e"},"schema_version":"1.0","source":{"id":"astro-ph/0703296","kind":"arxiv","version":1}},"canonical_sha256":"049c108d32c19dc79337b2ec6eb739e1c404c7af8356e6d81ffa59b98319afdf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"049c108d32c19dc79337b2ec6eb739e1c404c7af8356e6d81ffa59b98319afdf","first_computed_at":"2026-07-04T15:00:05.442536Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:00:05.442536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KgwK2bIb4PsGbEqlVkjCDBl0X7h9ZMNNbRMxRq2E413NJvE0CXVcKzqU9ZmRz2umBnvoonBRpMH1sUnZLmjdBw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:00:05.442926Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0703296","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb058a1c644adb14da464d35652e33e325e989b49b2c1317aaddd2efc4d2aac1","sha256:85b4bfe4046f7995141a7b8b48125bab53ff9b26bc408c826391b479001e8559"],"state_sha256":"7c60251d9e4007e473f1812bcf1638ceed4dcc899374794315e6e6fd9b3b7c41"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"egFYdF/AjVx/Y6VitQE97wMmFKPr7UryC+s7HKsFpQTEC8NcTGS4hUiz+RsBYpVMTBGeFk3srweNZBW3IL9eBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T11:41:14.726871Z","bundle_sha256":"addecda4f7f454b325eaea75cbf717f9240546a456e194dfc3e0068ed4949540"}}