{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:GHTKJNMP5UHLS3GVEGXWVWFQKL","short_pith_number":"pith:GHTKJNMP","canonical_record":{"source":{"id":"1708.08910","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-08-29T17:52:13Z","cross_cats_sorted":[],"title_canon_sha256":"9a765be00258f662e75e4cbea78e719d79fbb0371eeeb653e99b6656c2a81855","abstract_canon_sha256":"63b69b32d75179a88fd631ad4594b0dfad81b2b5f93656f1a70c480fcb258a55"},"schema_version":"1.0"},"canonical_sha256":"31e6a4b58fed0eb96cd521af6ad8b052e430a99c01524c8213f0d081f5592fae","source":{"kind":"arxiv","id":"1708.08910","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.08910","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"arxiv_version","alias_value":"1708.08910v2","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.08910","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"pith_short_12","alias_value":"GHTKJNMP5UHL","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GHTKJNMP5UHLS3GV","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GHTKJNMP","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:GHTKJNMP5UHLS3GVEGXWVWFQKL","target":"record","payload":{"canonical_record":{"source":{"id":"1708.08910","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-08-29T17:52:13Z","cross_cats_sorted":[],"title_canon_sha256":"9a765be00258f662e75e4cbea78e719d79fbb0371eeeb653e99b6656c2a81855","abstract_canon_sha256":"63b69b32d75179a88fd631ad4594b0dfad81b2b5f93656f1a70c480fcb258a55"},"schema_version":"1.0"},"canonical_sha256":"31e6a4b58fed0eb96cd521af6ad8b052e430a99c01524c8213f0d081f5592fae","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:32:05.480910Z","signature_b64":"o2F+qjKXvHGyuS+w6reMjLF9Xeq2guFXs8BHkiI5IX1L15Ha4gIH1nZi5JZoJOLOf6I0b3jBi2jLfRsXIYAtAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31e6a4b58fed0eb96cd521af6ad8b052e430a99c01524c8213f0d081f5592fae","last_reissued_at":"2026-05-18T00:32:05.480106Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:32:05.480106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.08910","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:32:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BD6sXjA64Ax3MAyb8416anXhcAFhwtM0kpwYMSdd2ocdkf8vALp7TaErPFiYoKqCKRpeKTr4xhLFBDuESHZ5Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:10:52.893002Z"},"content_sha256":"1af1499172864373d79b364b58c8d625fecac9fbdf6a97ad8ceb3430ba7a2f4a","schema_version":"1.0","event_id":"sha256:1af1499172864373d79b364b58c8d625fecac9fbdf6a97ad8ceb3430ba7a2f4a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:GHTKJNMP5UHLS3GVEGXWVWFQKL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Production of He, C and N by Low and Intermediate Mass Stars: A Comparison of Observed and Model-Predicted Planetary Nebula Abundances","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Balick, B.G. Stephenson, K.B. Kwitter, M.M. Miller Bertolami, R.B.C. Henry","submitted_at":"2017-08-29T17:52:13Z","abstract_excerpt":"The primary goal of this paper is to make a direct comparison between the measured and model-predicted abundances of He, C and N in a sample of 35 well-observed Galactic planetary nebulae (PN). All observations, data reductions, and abundance determinations were performed in house to ensure maximum homogeneity. Progenitor star masses (M < 4M_sun) were inferred using two published sets of post-AGB model tracks and L and T_eff values. We conclude the following: 1) the mean values of N/O across the progenitor mass range exceeds the solar value, indicating significant N enrichment in the majority "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.08910","kind":"arxiv","version":2},"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":"2026-05-18T00:32:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uWDAddMgpMkpeRgh3ZpBEGkfHdJbuuVReS83YDih4Ovh2m7haosAXXnFGjJ3Ysw/GtQQlS6GyIGXIUj3K0UgDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:10:52.893740Z"},"content_sha256":"a2b75f2ccf0e0bd87b0ff9e21189b275c1a27ee1e70257a2f86cd778e541e7e8","schema_version":"1.0","event_id":"sha256:a2b75f2ccf0e0bd87b0ff9e21189b275c1a27ee1e70257a2f86cd778e541e7e8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/bundle.json","state_url":"https://pith.science/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/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":"2026-05-31T00:10:52Z","links":{"resolver":"https://pith.science/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL","bundle":"https://pith.science/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/bundle.json","state":"https://pith.science/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GHTKJNMP5UHLS3GVEGXWVWFQKL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:GHTKJNMP5UHLS3GVEGXWVWFQKL","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":"63b69b32d75179a88fd631ad4594b0dfad81b2b5f93656f1a70c480fcb258a55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-08-29T17:52:13Z","title_canon_sha256":"9a765be00258f662e75e4cbea78e719d79fbb0371eeeb653e99b6656c2a81855"},"schema_version":"1.0","source":{"id":"1708.08910","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.08910","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"arxiv_version","alias_value":"1708.08910v2","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.08910","created_at":"2026-05-18T00:32:05Z"},{"alias_kind":"pith_short_12","alias_value":"GHTKJNMP5UHL","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GHTKJNMP5UHLS3GV","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GHTKJNMP","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:a2b75f2ccf0e0bd87b0ff9e21189b275c1a27ee1e70257a2f86cd778e541e7e8","target":"graph","created_at":"2026-05-18T00:32:05Z","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":"The primary goal of this paper is to make a direct comparison between the measured and model-predicted abundances of He, C and N in a sample of 35 well-observed Galactic planetary nebulae (PN). All observations, data reductions, and abundance determinations were performed in house to ensure maximum homogeneity. Progenitor star masses (M < 4M_sun) were inferred using two published sets of post-AGB model tracks and L and T_eff values. We conclude the following: 1) the mean values of N/O across the progenitor mass range exceeds the solar value, indicating significant N enrichment in the majority ","authors_text":"B. Balick, B.G. Stephenson, K.B. Kwitter, M.M. Miller Bertolami, R.B.C. Henry","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-08-29T17:52:13Z","title":"On the Production of He, C and N by Low and Intermediate Mass Stars: A Comparison of Observed and Model-Predicted Planetary Nebula Abundances"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.08910","kind":"arxiv","version":2},"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":"sha256:1af1499172864373d79b364b58c8d625fecac9fbdf6a97ad8ceb3430ba7a2f4a","target":"record","created_at":"2026-05-18T00:32:05Z","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":"63b69b32d75179a88fd631ad4594b0dfad81b2b5f93656f1a70c480fcb258a55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-08-29T17:52:13Z","title_canon_sha256":"9a765be00258f662e75e4cbea78e719d79fbb0371eeeb653e99b6656c2a81855"},"schema_version":"1.0","source":{"id":"1708.08910","kind":"arxiv","version":2}},"canonical_sha256":"31e6a4b58fed0eb96cd521af6ad8b052e430a99c01524c8213f0d081f5592fae","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31e6a4b58fed0eb96cd521af6ad8b052e430a99c01524c8213f0d081f5592fae","first_computed_at":"2026-05-18T00:32:05.480106Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:32:05.480106Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o2F+qjKXvHGyuS+w6reMjLF9Xeq2guFXs8BHkiI5IX1L15Ha4gIH1nZi5JZoJOLOf6I0b3jBi2jLfRsXIYAtAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:32:05.480910Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.08910","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1af1499172864373d79b364b58c8d625fecac9fbdf6a97ad8ceb3430ba7a2f4a","sha256:a2b75f2ccf0e0bd87b0ff9e21189b275c1a27ee1e70257a2f86cd778e541e7e8"],"state_sha256":"9a6f8824fa6391d2ef2c8b84ccc8335b1f192c1fe47355f792c879c789575d71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7hxkeMO74Zkl44+R2oKYz/uRaBFKGgSNRJLkpIhdQTAR0z6fsHzZyEI9VgR81Muyr1sEREazZ1bOQ3YMKwEYBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T00:10:52.897178Z","bundle_sha256":"92c2ac8f37669d522d968b6659b38b54899e055351953bc6bf9b5ae665f5e537"}}