{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:75M7UXXFZ6324GJK75NHGSZJV6","short_pith_number":"pith:75M7UXXF","canonical_record":{"source":{"id":"2112.04258","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-12-08T12:34:19Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"f49f3545b3cc81056a48be7047077bcd2d513623c733804b96e10140d6d13715","abstract_canon_sha256":"e92afa935e4f4e600e4ed688bc7fecaf4aaf790b0c0f50d09f818dd864ccc7d5"},"schema_version":"1.0"},"canonical_sha256":"ff59fa5ee5cfb7ae192aff5a734b29af84601db98756b96e532f8c53b3f8e684","source":{"kind":"arxiv","id":"2112.04258","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.04258","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"arxiv_version","alias_value":"2112.04258v1","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.04258","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_12","alias_value":"75M7UXXFZ632","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_16","alias_value":"75M7UXXFZ6324GJK","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_8","alias_value":"75M7UXXF","created_at":"2026-07-05T03:40:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:75M7UXXFZ6324GJK75NHGSZJV6","target":"record","payload":{"canonical_record":{"source":{"id":"2112.04258","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-12-08T12:34:19Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"f49f3545b3cc81056a48be7047077bcd2d513623c733804b96e10140d6d13715","abstract_canon_sha256":"e92afa935e4f4e600e4ed688bc7fecaf4aaf790b0c0f50d09f818dd864ccc7d5"},"schema_version":"1.0"},"canonical_sha256":"ff59fa5ee5cfb7ae192aff5a734b29af84601db98756b96e532f8c53b3f8e684","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:40:54.271662Z","signature_b64":"39DpxKD6/5MHwYxXCT1Pui0aEmCojjGkKkSpcaIBqOnkzmJR18ZsZjMiEo/EV2ERLjKvU7VN+TY0XTfECL4TAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff59fa5ee5cfb7ae192aff5a734b29af84601db98756b96e532f8c53b3f8e684","last_reissued_at":"2026-07-05T03:40:54.271221Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:40:54.271221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.04258","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":"2026-07-05T03:40:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Ivgyq26Mle0t2pInlpv4DIBhQpbhe7hQwH+XQ4XCloth1dy0DGvSX9VnEm9NRXkjWgWrc8SLOMCHXJuOikXBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T07:33:04.396224Z"},"content_sha256":"7eca922f1ba65ccd3bb2d1114799192b9f80b5e5f75b17f7654c22f71b25aed6","schema_version":"1.0","event_id":"sha256:7eca922f1ba65ccd3bb2d1114799192b9f80b5e5f75b17f7654c22f71b25aed6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:75M7UXXFZ6324GJK75NHGSZJV6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The MAGIC project. III. Radial and azimuthal Galactic abundance gradients using classical Cepheids","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. Kniazev, B. Lemasle, E.K. Grebel, G. Bono, I.A. Usenko, I.L. Andronov, L. Chinarova, L. Shakun, R.da Silva, V. Kovtyukh","submitted_at":"2021-12-08T12:34:19Z","abstract_excerpt":"Radial abundance gradients provide sound constraints for chemo-dynamical models of galaxies. Azimuthal variations of abundance ratios are solid diagnostics to understand their chemical enrichment. In this paper we investigate azimuthal variations of abundances in the Milky Way using Cepheids. We provide the detailed chemical composition (25 elements) of 105 Classical Cepheids from high-resolution SALT spectra observed by the MAGIC project. Negative abundance gradients, with abundances decreasing from the inner to the outer disc, have been reported both in the Milky Way and in external galaxies"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.04258","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/2112.04258/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":"2026-07-05T03:40:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Dbg6Mn431N+UpG8n0qj5O/vcENbI08suUrVvebXtuVJcvxkyAeAp4d2Lt2uSanBIs18W7GP9pdITXVghNPfJCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T07:33:04.397130Z"},"content_sha256":"df3f5a498235be07dc2f0014e71f3707c85ccc39ce2be20e6ac5029f593eb5a9","schema_version":"1.0","event_id":"sha256:df3f5a498235be07dc2f0014e71f3707c85ccc39ce2be20e6ac5029f593eb5a9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/75M7UXXFZ6324GJK75NHGSZJV6/bundle.json","state_url":"https://pith.science/pith/75M7UXXFZ6324GJK75NHGSZJV6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/75M7UXXFZ6324GJK75NHGSZJV6/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":"2026-08-10T07:33:04Z","links":{"resolver":"https://pith.science/pith/75M7UXXFZ6324GJK75NHGSZJV6","bundle":"https://pith.science/pith/75M7UXXFZ6324GJK75NHGSZJV6/bundle.json","state":"https://pith.science/pith/75M7UXXFZ6324GJK75NHGSZJV6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/75M7UXXFZ6324GJK75NHGSZJV6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:75M7UXXFZ6324GJK75NHGSZJV6","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":"e92afa935e4f4e600e4ed688bc7fecaf4aaf790b0c0f50d09f818dd864ccc7d5","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-12-08T12:34:19Z","title_canon_sha256":"f49f3545b3cc81056a48be7047077bcd2d513623c733804b96e10140d6d13715"},"schema_version":"1.0","source":{"id":"2112.04258","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.04258","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"arxiv_version","alias_value":"2112.04258v1","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.04258","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_12","alias_value":"75M7UXXFZ632","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_16","alias_value":"75M7UXXFZ6324GJK","created_at":"2026-07-05T03:40:54Z"},{"alias_kind":"pith_short_8","alias_value":"75M7UXXF","created_at":"2026-07-05T03:40:54Z"}],"graph_snapshots":[{"event_id":"sha256:df3f5a498235be07dc2f0014e71f3707c85ccc39ce2be20e6ac5029f593eb5a9","target":"graph","created_at":"2026-07-05T03:40:54Z","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/2112.04258/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Radial abundance gradients provide sound constraints for chemo-dynamical models of galaxies. Azimuthal variations of abundance ratios are solid diagnostics to understand their chemical enrichment. In this paper we investigate azimuthal variations of abundances in the Milky Way using Cepheids. We provide the detailed chemical composition (25 elements) of 105 Classical Cepheids from high-resolution SALT spectra observed by the MAGIC project. Negative abundance gradients, with abundances decreasing from the inner to the outer disc, have been reported both in the Milky Way and in external galaxies","authors_text":"A. Kniazev, B. Lemasle, E.K. Grebel, G. Bono, I.A. Usenko, I.L. Andronov, L. Chinarova, L. Shakun, R.da Silva, V. Kovtyukh","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-12-08T12:34:19Z","title":"The MAGIC project. III. Radial and azimuthal Galactic abundance gradients using classical Cepheids"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.04258","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":"sha256:7eca922f1ba65ccd3bb2d1114799192b9f80b5e5f75b17f7654c22f71b25aed6","target":"record","created_at":"2026-07-05T03:40:54Z","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":"e92afa935e4f4e600e4ed688bc7fecaf4aaf790b0c0f50d09f818dd864ccc7d5","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-12-08T12:34:19Z","title_canon_sha256":"f49f3545b3cc81056a48be7047077bcd2d513623c733804b96e10140d6d13715"},"schema_version":"1.0","source":{"id":"2112.04258","kind":"arxiv","version":1}},"canonical_sha256":"ff59fa5ee5cfb7ae192aff5a734b29af84601db98756b96e532f8c53b3f8e684","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff59fa5ee5cfb7ae192aff5a734b29af84601db98756b96e532f8c53b3f8e684","first_computed_at":"2026-07-05T03:40:54.271221Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:40:54.271221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"39DpxKD6/5MHwYxXCT1Pui0aEmCojjGkKkSpcaIBqOnkzmJR18ZsZjMiEo/EV2ERLjKvU7VN+TY0XTfECL4TAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:40:54.271662Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.04258","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7eca922f1ba65ccd3bb2d1114799192b9f80b5e5f75b17f7654c22f71b25aed6","sha256:df3f5a498235be07dc2f0014e71f3707c85ccc39ce2be20e6ac5029f593eb5a9"],"state_sha256":"80af542649f81b94e704192b056be8523825ce68d07dd5664e45dcfc96a65ee3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XH2yyvFdNjN7jvWjXQfu2Ifh0hpx28grvDk6NKLQ7I2GOIO25N+2EVY2fHNZVR6agw9qpyTvNFrOQUI8sK/YAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T07:33:04.402582Z","bundle_sha256":"51699e63628a30f691c6e8f3c9a1f3d1875915dff27b41eb6693933282a28542"}}