{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:JESV32T5ZIUVJTVBC7E3SQGYGT","short_pith_number":"pith:JESV32T5","canonical_record":{"source":{"id":"1109.2943","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-13T21:50:21Z","cross_cats_sorted":[],"title_canon_sha256":"5587491e05504f85e4f9882c461184a9a61413c4f07298c5fabcfa890995e09c","abstract_canon_sha256":"d89c1d1bac4f6b8c9f3e684c7999025bf87f14fe90be61543a856b8824e03c27"},"schema_version":"1.0"},"canonical_sha256":"49255dea7dca2954cea117c9b940d834fa9cedf9c93d62c1dce9630467bf09ce","source":{"kind":"arxiv","id":"1109.2943","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.2943","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"arxiv_version","alias_value":"1109.2943v1","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.2943","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"pith_short_12","alias_value":"JESV32T5ZIUV","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JESV32T5ZIUVJTVB","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JESV32T5","created_at":"2026-05-18T12:26:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:JESV32T5ZIUVJTVBC7E3SQGYGT","target":"record","payload":{"canonical_record":{"source":{"id":"1109.2943","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-13T21:50:21Z","cross_cats_sorted":[],"title_canon_sha256":"5587491e05504f85e4f9882c461184a9a61413c4f07298c5fabcfa890995e09c","abstract_canon_sha256":"d89c1d1bac4f6b8c9f3e684c7999025bf87f14fe90be61543a856b8824e03c27"},"schema_version":"1.0"},"canonical_sha256":"49255dea7dca2954cea117c9b940d834fa9cedf9c93d62c1dce9630467bf09ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:33.285028Z","signature_b64":"J3+ooOAxFNJiGFUGzWfsg/6NkQsofHF0fLUimgpvDK4+iXfgG9Orm6stZeLcoa1z919zXTdKS8QY2s/FPfXbBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49255dea7dca2954cea117c9b940d834fa9cedf9c93d62c1dce9630467bf09ce","last_reissued_at":"2026-05-18T02:00:33.284419Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:33.284419Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.2943","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":"2026-05-18T02:00:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/TufzgSWy2UrlEsnDw0y48uNXjtH+ztFoLvYMWcrreSV3J5xLrUAEEUB0O5JuUmI5WyTCIn165qMy1Fkbl4gAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:44:07.548647Z"},"content_sha256":"18c0c28b8cf535d5fbb89d5fa7b86647b7ff5685c64fc39ae9c9d1d6d5a301c3","schema_version":"1.0","event_id":"sha256:18c0c28b8cf535d5fbb89d5fa7b86647b7ff5685c64fc39ae9c9d1d6d5a301c3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:JESV32T5ZIUVJTVBC7E3SQGYGT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"B. Balick, E.M.M. Lehman, K.B. Kwitter, R.B.C. Henry","submitted_at":"2011-09-13T21:50:21Z","abstract_excerpt":"We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way. We also derive the radial oxygen gradient in M31, which is shallower than that in the Milky Way, even accounting for M31's larger disk scale length."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.2943","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":"2026-05-18T02:00:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oWtMTYwJDt+Y7zKjxZ0yr80SMxeQ+IXR6TECwteVbcsiSdgp3wP9nEVB86yAXmQC9P4uwUKB0fiJ18zZg7RTCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:44:07.549283Z"},"content_sha256":"8d9e2f1d54cc629b30512fc4c47e59a7070825823ea080d61e2f96f2b458efc3","schema_version":"1.0","event_id":"sha256:8d9e2f1d54cc629b30512fc4c47e59a7070825823ea080d61e2f96f2b458efc3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/bundle.json","state_url":"https://pith.science/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/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":"2026-05-30T17:44:07Z","links":{"resolver":"https://pith.science/pith/JESV32T5ZIUVJTVBC7E3SQGYGT","bundle":"https://pith.science/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/bundle.json","state":"https://pith.science/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JESV32T5ZIUVJTVBC7E3SQGYGT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:JESV32T5ZIUVJTVBC7E3SQGYGT","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":"d89c1d1bac4f6b8c9f3e684c7999025bf87f14fe90be61543a856b8824e03c27","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-13T21:50:21Z","title_canon_sha256":"5587491e05504f85e4f9882c461184a9a61413c4f07298c5fabcfa890995e09c"},"schema_version":"1.0","source":{"id":"1109.2943","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.2943","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"arxiv_version","alias_value":"1109.2943v1","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.2943","created_at":"2026-05-18T02:00:33Z"},{"alias_kind":"pith_short_12","alias_value":"JESV32T5ZIUV","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JESV32T5ZIUVJTVB","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JESV32T5","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:8d9e2f1d54cc629b30512fc4c47e59a7070825823ea080d61e2f96f2b458efc3","target":"graph","created_at":"2026-05-18T02:00:33Z","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 have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way. We also derive the radial oxygen gradient in M31, which is shallower than that in the Milky Way, even accounting for M31's larger disk scale length.","authors_text":"B. Balick, E.M.M. Lehman, K.B. Kwitter, R.B.C. Henry","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-13T21:50:21Z","title":"Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.2943","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":"sha256:18c0c28b8cf535d5fbb89d5fa7b86647b7ff5685c64fc39ae9c9d1d6d5a301c3","target":"record","created_at":"2026-05-18T02:00:33Z","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":"d89c1d1bac4f6b8c9f3e684c7999025bf87f14fe90be61543a856b8824e03c27","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2011-09-13T21:50:21Z","title_canon_sha256":"5587491e05504f85e4f9882c461184a9a61413c4f07298c5fabcfa890995e09c"},"schema_version":"1.0","source":{"id":"1109.2943","kind":"arxiv","version":1}},"canonical_sha256":"49255dea7dca2954cea117c9b940d834fa9cedf9c93d62c1dce9630467bf09ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49255dea7dca2954cea117c9b940d834fa9cedf9c93d62c1dce9630467bf09ce","first_computed_at":"2026-05-18T02:00:33.284419Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:33.284419Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"J3+ooOAxFNJiGFUGzWfsg/6NkQsofHF0fLUimgpvDK4+iXfgG9Orm6stZeLcoa1z919zXTdKS8QY2s/FPfXbBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:33.285028Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.2943","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:18c0c28b8cf535d5fbb89d5fa7b86647b7ff5685c64fc39ae9c9d1d6d5a301c3","sha256:8d9e2f1d54cc629b30512fc4c47e59a7070825823ea080d61e2f96f2b458efc3"],"state_sha256":"4a67127b6f5c0539b09b75e313605489efea62fe2e52f4934b9b33c02377c12d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EgEPR+fJVZGNNxrjkfliEOzQlo5STX9yMoBr6RcgPsILE4yFvAzXpyVShfWmhuUq+SKXOZ+uTdRySU2wK5+WBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T17:44:07.552548Z","bundle_sha256":"afec1a242eca4b89764482fe7d2ffac379ff70c3b88d0ce4b5bba3742c9dc9d4"}}