{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:U23NZIPWFZ6UD72EF5UEE4DSPQ","short_pith_number":"pith:U23NZIPW","canonical_record":{"source":{"id":"1404.2524","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-09T15:43:48Z","cross_cats_sorted":[],"title_canon_sha256":"fbace799245b5eb268b5ef1887e53a0c8bc04455b1425b9bfe8e208504a21ee0","abstract_canon_sha256":"1f2362a2710916bbc0dc83cd2ca39f12f888874193466f95bc4b31c757e2d45f"},"schema_version":"1.0"},"canonical_sha256":"a6b6dca1f62e7d41ff442f684270727c1acb25f8f70538ad5fe6cc40c9f763a0","source":{"kind":"arxiv","id":"1404.2524","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1404.2524","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"arxiv_version","alias_value":"1404.2524v1","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1404.2524","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"pith_short_12","alias_value":"U23NZIPWFZ6U","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"U23NZIPWFZ6UD72E","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"U23NZIPW","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:U23NZIPWFZ6UD72EF5UEE4DSPQ","target":"record","payload":{"canonical_record":{"source":{"id":"1404.2524","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-09T15:43:48Z","cross_cats_sorted":[],"title_canon_sha256":"fbace799245b5eb268b5ef1887e53a0c8bc04455b1425b9bfe8e208504a21ee0","abstract_canon_sha256":"1f2362a2710916bbc0dc83cd2ca39f12f888874193466f95bc4b31c757e2d45f"},"schema_version":"1.0"},"canonical_sha256":"a6b6dca1f62e7d41ff442f684270727c1acb25f8f70538ad5fe6cc40c9f763a0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:36.094538Z","signature_b64":"RMTDF4lsSFrA+3heE9SKKqnV8quAoYXeXyPxPiNJnH18qMn+cSwiyhMF1lGwlNfSKxZP/LZVCzA2bQ9+H0GrBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a6b6dca1f62e7d41ff442f684270727c1acb25f8f70538ad5fe6cc40c9f763a0","last_reissued_at":"2026-05-18T01:43:36.094008Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:36.094008Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1404.2524","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":"2026-05-18T01:43:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v2Okzt7vlP9gAEvXvvQpRFdgTgabVrB7qvam5RVijuyP2WemwEjP9ec54+EYOoBTJbF6bsS69+GMwxFjElyoBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:50:42.205697Z"},"content_sha256":"173b18f26c2c844b4dc05634f46a288593c87acf50e1046ed8e7b88d8410b08e","schema_version":"1.0","event_id":"sha256:173b18f26c2c844b4dc05634f46a288593c87acf50e1046ed8e7b88d8410b08e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:U23NZIPWFZ6UD72EF5UEE4DSPQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Zinc abundances of planetary nebulae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Albert A. Zijlstra, Christina L. Smith, Harriet L. Dinerstein","submitted_at":"2014-04-09T15:43:48Z","abstract_excerpt":"Zinc is a useful surrogate element for measuring Fe/H as, unlike iron, it is not depleted in the gas phase media. Zn/H and O/Zn ratios have been derived using the [Zn IV] emission line at 3.625um for a sample of nine Galactic planetary nebulae, seven of which are based upon new observations using the VLT. Based on photoionization models, O/O++ is the most reliable ionisation correction factor for zinc that can readily be determined from optical emission lines, with an estimated accuracy of 10% or better for all targets in our sample. The majority of the sample is found to be sub-solar in [Zn/H"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.2524","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":"2026-05-18T01:43:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qNYJkNF7N/buLxpkZzl4slJyO+QNqdRmSiPv1VcAcbz0VHf+lF2hp9jZN7TvWlYL3fzFBo00+OPwa4fl6Bp6BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T07:50:42.206072Z"},"content_sha256":"b224dc7ca07de92b608f69011029cec42279b6bfc2b2f9682d552ded54db933a","schema_version":"1.0","event_id":"sha256:b224dc7ca07de92b608f69011029cec42279b6bfc2b2f9682d552ded54db933a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/bundle.json","state_url":"https://pith.science/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/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":"2026-06-02T07:50:42Z","links":{"resolver":"https://pith.science/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ","bundle":"https://pith.science/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/bundle.json","state":"https://pith.science/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U23NZIPWFZ6UD72EF5UEE4DSPQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:U23NZIPWFZ6UD72EF5UEE4DSPQ","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":"1f2362a2710916bbc0dc83cd2ca39f12f888874193466f95bc4b31c757e2d45f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-09T15:43:48Z","title_canon_sha256":"fbace799245b5eb268b5ef1887e53a0c8bc04455b1425b9bfe8e208504a21ee0"},"schema_version":"1.0","source":{"id":"1404.2524","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1404.2524","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"arxiv_version","alias_value":"1404.2524v1","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1404.2524","created_at":"2026-05-18T01:43:36Z"},{"alias_kind":"pith_short_12","alias_value":"U23NZIPWFZ6U","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"U23NZIPWFZ6UD72E","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"U23NZIPW","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:b224dc7ca07de92b608f69011029cec42279b6bfc2b2f9682d552ded54db933a","target":"graph","created_at":"2026-05-18T01:43:36Z","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":"Zinc is a useful surrogate element for measuring Fe/H as, unlike iron, it is not depleted in the gas phase media. Zn/H and O/Zn ratios have been derived using the [Zn IV] emission line at 3.625um for a sample of nine Galactic planetary nebulae, seven of which are based upon new observations using the VLT. Based on photoionization models, O/O++ is the most reliable ionisation correction factor for zinc that can readily be determined from optical emission lines, with an estimated accuracy of 10% or better for all targets in our sample. The majority of the sample is found to be sub-solar in [Zn/H","authors_text":"Albert A. Zijlstra, Christina L. Smith, Harriet L. Dinerstein","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-09T15:43:48Z","title":"Zinc abundances of planetary nebulae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1404.2524","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":"sha256:173b18f26c2c844b4dc05634f46a288593c87acf50e1046ed8e7b88d8410b08e","target":"record","created_at":"2026-05-18T01:43:36Z","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":"1f2362a2710916bbc0dc83cd2ca39f12f888874193466f95bc4b31c757e2d45f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-04-09T15:43:48Z","title_canon_sha256":"fbace799245b5eb268b5ef1887e53a0c8bc04455b1425b9bfe8e208504a21ee0"},"schema_version":"1.0","source":{"id":"1404.2524","kind":"arxiv","version":1}},"canonical_sha256":"a6b6dca1f62e7d41ff442f684270727c1acb25f8f70538ad5fe6cc40c9f763a0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a6b6dca1f62e7d41ff442f684270727c1acb25f8f70538ad5fe6cc40c9f763a0","first_computed_at":"2026-05-18T01:43:36.094008Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:43:36.094008Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RMTDF4lsSFrA+3heE9SKKqnV8quAoYXeXyPxPiNJnH18qMn+cSwiyhMF1lGwlNfSKxZP/LZVCzA2bQ9+H0GrBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:43:36.094538Z","signed_message":"canonical_sha256_bytes"},"source_id":"1404.2524","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:173b18f26c2c844b4dc05634f46a288593c87acf50e1046ed8e7b88d8410b08e","sha256:b224dc7ca07de92b608f69011029cec42279b6bfc2b2f9682d552ded54db933a"],"state_sha256":"8b7b47bb960071ada8efb1b0fc3b977a1f4920ecea6c1ab843c3b970ca6913e0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ioxd7AJTUI4jFi7vYDVgnZDorNt9AzDjQrTXEWzRtMvNRIvtGqNvJIf/mjG5Hskm0cYmiZVyEAkSuDol0tzLBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T07:50:42.208299Z","bundle_sha256":"a990e00e57846638f1694a729063d2ec7612882fa9b8d2e8e0b347bbdb2881d3"}}