{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:YDMELBCPVUAPTMVWBRVH6IXT2Y","short_pith_number":"pith:YDMELBCP","canonical_record":{"source":{"id":"1003.0759","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-03-03T09:34:59Z","cross_cats_sorted":[],"title_canon_sha256":"6d6e66e6143bf29be4518033b868b0f69c79c45fa00eed78552cf497debf24b8","abstract_canon_sha256":"e2f2ac97dd6243c577c7170b4006fd7e02597a19338afd5da0206358ea0510e6"},"schema_version":"1.0"},"canonical_sha256":"c0d845844fad00f9b2b60c6a7f22f3d606055cf8ba1139dba9557a79fe1b46cd","source":{"kind":"arxiv","id":"1003.0759","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.0759","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"arxiv_version","alias_value":"1003.0759v1","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.0759","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"pith_short_12","alias_value":"YDMELBCPVUAP","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YDMELBCPVUAPTMVW","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YDMELBCP","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:YDMELBCPVUAPTMVWBRVH6IXT2Y","target":"record","payload":{"canonical_record":{"source":{"id":"1003.0759","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-03-03T09:34:59Z","cross_cats_sorted":[],"title_canon_sha256":"6d6e66e6143bf29be4518033b868b0f69c79c45fa00eed78552cf497debf24b8","abstract_canon_sha256":"e2f2ac97dd6243c577c7170b4006fd7e02597a19338afd5da0206358ea0510e6"},"schema_version":"1.0"},"canonical_sha256":"c0d845844fad00f9b2b60c6a7f22f3d606055cf8ba1139dba9557a79fe1b46cd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:08:47.231932Z","signature_b64":"w+fi/3X5v3oyP+QkrUKt+2tWBJMbLQW6fXSZZR4f/+mYzIhxPFvNefK1PktvwAtLIL70YTcbiaLvkOLyqqFYDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c0d845844fad00f9b2b60c6a7f22f3d606055cf8ba1139dba9557a79fe1b46cd","last_reissued_at":"2026-05-18T02:08:47.231366Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:08:47.231366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1003.0759","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":"2026-05-18T02:08:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ABWcL9rCdtmM0O0HO6owthhqU6Hk/Qdu3MdYZe715pozWcak2wE1sRxZd1cNyAQ/zUHU+6XdrEQbFuWgQynpDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:55:15.491157Z"},"content_sha256":"1ac4e7d21cce22f37d81b760cd47ab8c64485ddb4b71796ebe0a7e35c057915d","schema_version":"1.0","event_id":"sha256:1ac4e7d21cce22f37d81b760cd47ab8c64485ddb4b71796ebe0a7e35c057915d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:YDMELBCPVUAPTMVWBRVH6IXT2Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Galactic structure and chemical evolution traced by the population of planetary nebulae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"L. Stanghellini, M. Haywood","submitted_at":"2010-03-03T09:34:59Z","abstract_excerpt":"We use an extended and homogeneous data set of Galactic planetary nebulae (PNe) to study the metallicity gradients and the Galactic structure and evolution. The most up-to-date abundances, distances (calibrated with Magellanic Cloud PNe) have been employed, together with a novel homogeneous morphological classification, to characterize the different PN populations. We confirm that morphological classes have a strong correlation with PN Peimbert's Type, and also with their distribution on the Galactic landscape. We studied the alpha-element distribution within the Galactic disk, and found that "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.0759","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":"2026-05-18T02:08:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RyWW3cqQM79w7SddGj4ryznRqaM+gGpdrA3kCw0ViIMamWDiGEXhNBdpETufDWyKA0sfZ6z6u6ccpj2ytq4KCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:55:15.491525Z"},"content_sha256":"111002700eef56d4a229baea34d4ed9c7ce9780eb6971b0a693ec62bb0701680","schema_version":"1.0","event_id":"sha256:111002700eef56d4a229baea34d4ed9c7ce9780eb6971b0a693ec62bb0701680"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/bundle.json","state_url":"https://pith.science/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/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":"2026-06-02T22:55:15Z","links":{"resolver":"https://pith.science/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y","bundle":"https://pith.science/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/bundle.json","state":"https://pith.science/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YDMELBCPVUAPTMVWBRVH6IXT2Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:YDMELBCPVUAPTMVWBRVH6IXT2Y","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":"e2f2ac97dd6243c577c7170b4006fd7e02597a19338afd5da0206358ea0510e6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-03-03T09:34:59Z","title_canon_sha256":"6d6e66e6143bf29be4518033b868b0f69c79c45fa00eed78552cf497debf24b8"},"schema_version":"1.0","source":{"id":"1003.0759","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1003.0759","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"arxiv_version","alias_value":"1003.0759v1","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.0759","created_at":"2026-05-18T02:08:47Z"},{"alias_kind":"pith_short_12","alias_value":"YDMELBCPVUAP","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YDMELBCPVUAPTMVW","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YDMELBCP","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:111002700eef56d4a229baea34d4ed9c7ce9780eb6971b0a693ec62bb0701680","target":"graph","created_at":"2026-05-18T02:08:47Z","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 use an extended and homogeneous data set of Galactic planetary nebulae (PNe) to study the metallicity gradients and the Galactic structure and evolution. The most up-to-date abundances, distances (calibrated with Magellanic Cloud PNe) have been employed, together with a novel homogeneous morphological classification, to characterize the different PN populations. We confirm that morphological classes have a strong correlation with PN Peimbert's Type, and also with their distribution on the Galactic landscape. We studied the alpha-element distribution within the Galactic disk, and found that ","authors_text":"L. Stanghellini, M. Haywood","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-03-03T09:34:59Z","title":"The Galactic structure and chemical evolution traced by the population of planetary nebulae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.0759","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":"sha256:1ac4e7d21cce22f37d81b760cd47ab8c64485ddb4b71796ebe0a7e35c057915d","target":"record","created_at":"2026-05-18T02:08:47Z","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":"e2f2ac97dd6243c577c7170b4006fd7e02597a19338afd5da0206358ea0510e6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-03-03T09:34:59Z","title_canon_sha256":"6d6e66e6143bf29be4518033b868b0f69c79c45fa00eed78552cf497debf24b8"},"schema_version":"1.0","source":{"id":"1003.0759","kind":"arxiv","version":1}},"canonical_sha256":"c0d845844fad00f9b2b60c6a7f22f3d606055cf8ba1139dba9557a79fe1b46cd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0d845844fad00f9b2b60c6a7f22f3d606055cf8ba1139dba9557a79fe1b46cd","first_computed_at":"2026-05-18T02:08:47.231366Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:08:47.231366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w+fi/3X5v3oyP+QkrUKt+2tWBJMbLQW6fXSZZR4f/+mYzIhxPFvNefK1PktvwAtLIL70YTcbiaLvkOLyqqFYDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:08:47.231932Z","signed_message":"canonical_sha256_bytes"},"source_id":"1003.0759","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1ac4e7d21cce22f37d81b760cd47ab8c64485ddb4b71796ebe0a7e35c057915d","sha256:111002700eef56d4a229baea34d4ed9c7ce9780eb6971b0a693ec62bb0701680"],"state_sha256":"bdc1ec9195c7abe6a798af67a2a651076a0fd407058edcbea05194a24e558cd9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A/EisoahFY5zKpnQ/xgNIgf5YVV7WKjs4o+iDLhD6U12yXVqjbaW47batNpFDBmPWt8nM38936PhEAtp4YiqDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T22:55:15.493465Z","bundle_sha256":"b4e063655c0d21ad5ab816e67d616726addad859eb1a74cdb6e21bc3eef53478"}}