{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:OEP4KG4PH67M2KVPXZD3WWR7XX","short_pith_number":"pith:OEP4KG4P","canonical_record":{"source":{"id":"astro-ph/0406642","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-06-29T09:28:02Z","cross_cats_sorted":[],"title_canon_sha256":"c5aa711529e554a0363257c6cd30a87d5e5129b57579353a176fa89f53d13ced","abstract_canon_sha256":"71fc8563d8b3b79d6ce5eb44b694d106d10784b7df4c92f9a96eda45fad4bbba"},"schema_version":"1.0"},"canonical_sha256":"711fc51b8f3fbecd2aafbe47bb5a3fbdd8f60441347a28b9ca1cd98ec0d9782a","source":{"kind":"arxiv","id":"astro-ph/0406642","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0406642","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0406642v1","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0406642","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"OEP4KG4PH67M","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"OEP4KG4PH67M2KVP","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"OEP4KG4P","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:OEP4KG4PH67M2KVPXZD3WWR7XX","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0406642","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-06-29T09:28:02Z","cross_cats_sorted":[],"title_canon_sha256":"c5aa711529e554a0363257c6cd30a87d5e5129b57579353a176fa89f53d13ced","abstract_canon_sha256":"71fc8563d8b3b79d6ce5eb44b694d106d10784b7df4c92f9a96eda45fad4bbba"},"schema_version":"1.0"},"canonical_sha256":"711fc51b8f3fbecd2aafbe47bb5a3fbdd8f60441347a28b9ca1cd98ec0d9782a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:32.400016Z","signature_b64":"OcXqFuEVBoywfa2xw15DqxQEal6UIRruITXTKO3huXkBYVTOK2RNFdJ0GiETAu/ue8UxRolqDXDDJXR33q6QCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"711fc51b8f3fbecd2aafbe47bb5a3fbdd8f60441347a28b9ca1cd98ec0d9782a","last_reissued_at":"2026-05-18T01:07:32.399399Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:32.399399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0406642","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":"2026-05-18T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4oTnyrwDEhDVh4vrG7pxl3JHVDv+tknrWCl5oFg6b/F0djXFuwss1RbnZhP7j+zygfMPctSRFvgjZTXGY+++Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T10:22:52.659806Z"},"content_sha256":"b1413340c885ca06101f305052079ec489e39ecdfba00327e1effcdaab6cfbd2","schema_version":"1.0","event_id":"sha256:b1413340c885ca06101f305052079ec489e39ecdfba00327e1effcdaab6cfbd2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:OEP4KG4PH67M2KVPXZD3WWR7XX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemical Abundances of Planetary Nebulae in M33","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Mampaso, L. Magrini, M. Perinotto, R. L. M . Corradi","submitted_at":"2004-06-29T09:28:02Z","abstract_excerpt":"Using spectroscopic data presented in Magrini et al. (2003), we have analyzed with the photoionization code CLOUDY 94.00 (Ferland et al. 1998) 11 Planetary Nebulae belonging to the spiral galaxy M 33. Central star temperatures and nebular parameters have been determined. In particular the chemical abundances of He/H, O/H, N/H, Ar/H, and S/H have been measured and compared with values obtained via the Ionization Correction Factors (ICFs) method, when available. Chemical abundance relationships have been investigated; in particular, a correlation between N/H and N/O similar to the Galactic one ("},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0406642","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":"2026-05-18T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H5foPjnsVb+lB0LiRjZAQwXk6yDShDLFq9BeIsTtMu7oAim8IJO5p/HjGZDTkhYhnkGzLEaSNe+I7JGDVxRBCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T10:22:52.660155Z"},"content_sha256":"39aba3c73fdeae035cb52460a8d589dd76ce275e4386f1c8d45a014656c608e6","schema_version":"1.0","event_id":"sha256:39aba3c73fdeae035cb52460a8d589dd76ce275e4386f1c8d45a014656c608e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/bundle.json","state_url":"https://pith.science/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/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":"2026-06-26T10:22:52Z","links":{"resolver":"https://pith.science/pith/OEP4KG4PH67M2KVPXZD3WWR7XX","bundle":"https://pith.science/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/bundle.json","state":"https://pith.science/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OEP4KG4PH67M2KVPXZD3WWR7XX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:OEP4KG4PH67M2KVPXZD3WWR7XX","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":"71fc8563d8b3b79d6ce5eb44b694d106d10784b7df4c92f9a96eda45fad4bbba","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-06-29T09:28:02Z","title_canon_sha256":"c5aa711529e554a0363257c6cd30a87d5e5129b57579353a176fa89f53d13ced"},"schema_version":"1.0","source":{"id":"astro-ph/0406642","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0406642","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0406642v1","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0406642","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"OEP4KG4PH67M","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"OEP4KG4PH67M2KVP","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"OEP4KG4P","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:39aba3c73fdeae035cb52460a8d589dd76ce275e4386f1c8d45a014656c608e6","target":"graph","created_at":"2026-05-18T01:07:32Z","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":"Using spectroscopic data presented in Magrini et al. (2003), we have analyzed with the photoionization code CLOUDY 94.00 (Ferland et al. 1998) 11 Planetary Nebulae belonging to the spiral galaxy M 33. Central star temperatures and nebular parameters have been determined. In particular the chemical abundances of He/H, O/H, N/H, Ar/H, and S/H have been measured and compared with values obtained via the Ionization Correction Factors (ICFs) method, when available. Chemical abundance relationships have been investigated; in particular, a correlation between N/H and N/O similar to the Galactic one (","authors_text":"A. Mampaso, L. Magrini, M. Perinotto, R. L. M . Corradi","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2004-06-29T09:28:02Z","title":"Chemical Abundances of Planetary Nebulae in M33"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0406642","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:b1413340c885ca06101f305052079ec489e39ecdfba00327e1effcdaab6cfbd2","target":"record","created_at":"2026-05-18T01:07:32Z","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":"71fc8563d8b3b79d6ce5eb44b694d106d10784b7df4c92f9a96eda45fad4bbba","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-06-29T09:28:02Z","title_canon_sha256":"c5aa711529e554a0363257c6cd30a87d5e5129b57579353a176fa89f53d13ced"},"schema_version":"1.0","source":{"id":"astro-ph/0406642","kind":"arxiv","version":1}},"canonical_sha256":"711fc51b8f3fbecd2aafbe47bb5a3fbdd8f60441347a28b9ca1cd98ec0d9782a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"711fc51b8f3fbecd2aafbe47bb5a3fbdd8f60441347a28b9ca1cd98ec0d9782a","first_computed_at":"2026-05-18T01:07:32.399399Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:32.399399Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OcXqFuEVBoywfa2xw15DqxQEal6UIRruITXTKO3huXkBYVTOK2RNFdJ0GiETAu/ue8UxRolqDXDDJXR33q6QCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:32.400016Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0406642","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b1413340c885ca06101f305052079ec489e39ecdfba00327e1effcdaab6cfbd2","sha256:39aba3c73fdeae035cb52460a8d589dd76ce275e4386f1c8d45a014656c608e6"],"state_sha256":"cea60d815b57be912a1ded562a99ed256292929457af1a4fa1ae09663add00c1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rs0ImZYswyi35RN6lV5Sx9q6PF3+Lm+xHg4guejju0TClqJ96WvORb39+miWtlN1wF6icjpgdOxKDq9yDY5mAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T10:22:52.662083Z","bundle_sha256":"4d0859e9b6d42ef2a8bd8189ab21dd9ae36312e9a1e860ab6e2c43dd4e3d001d"}}