{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:ZPUNFJSSNPURNAXVXPIQMEFK2S","short_pith_number":"pith:ZPUNFJSS","canonical_record":{"source":{"id":"1109.3663","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-09-16T16:58:01Z","cross_cats_sorted":[],"title_canon_sha256":"098b5cf3c9b7b1ed6964c021c16c3f15aaed2da537c3cbfc57558edd2101cdbb","abstract_canon_sha256":"9ef03a3ab6d0c9e8bb29f167dccc1f1860f7d3ab9c905bed6846fda301a7ea3a"},"schema_version":"1.0"},"canonical_sha256":"cbe8d2a6526be91682f5bbd10610aad492b4d7adfa6850be65bd424bd350572c","source":{"kind":"arxiv","id":"1109.3663","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3663","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3663v1","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3663","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZPUNFJSSNPUR","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"ZPUNFJSSNPURNAXV","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"ZPUNFJSS","created_at":"2026-05-18T12:26:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:ZPUNFJSSNPURNAXVXPIQMEFK2S","target":"record","payload":{"canonical_record":{"source":{"id":"1109.3663","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-09-16T16:58:01Z","cross_cats_sorted":[],"title_canon_sha256":"098b5cf3c9b7b1ed6964c021c16c3f15aaed2da537c3cbfc57558edd2101cdbb","abstract_canon_sha256":"9ef03a3ab6d0c9e8bb29f167dccc1f1860f7d3ab9c905bed6846fda301a7ea3a"},"schema_version":"1.0"},"canonical_sha256":"cbe8d2a6526be91682f5bbd10610aad492b4d7adfa6850be65bd424bd350572c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:31.757701Z","signature_b64":"cjo0+3a56RwOtRT1VFqSeiKOg/rgU4+rYTvlGqCp9+Dh+WaceCHFd/g353JOhaCQ7SW8N1ixFoadzWJijPMUDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cbe8d2a6526be91682f5bbd10610aad492b4d7adfa6850be65bd424bd350572c","last_reissued_at":"2026-05-18T02:00:31.756974Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:31.756974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.3663","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":"2026-05-18T02:00:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GPZPDmezcRaJ4ijMPLIyr8rNaLoqw2iQjrvxyrDvdjH/CBsV2Ino9wwQz+E/tkxPucTo0CdnyDO/1kEn2912Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:10:16.978020Z"},"content_sha256":"a215c5284eb50db2c4cab383ac8b4e5fd561e2c7d964cddd1ddafaf3696c883a","schema_version":"1.0","event_id":"sha256:a215c5284eb50db2c4cab383ac8b4e5fd561e2c7d964cddd1ddafaf3696c883a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:ZPUNFJSSNPURNAXVXPIQMEFK2S","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Close to the Dredge: Precise X-ray C and N Abundances in lambda Andromeda and its Precocious RGB Mixing Problem","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Ball, J.J. Drake, John J. Eldridge, J.-U. Ness, Richard J. Stancliffe","submitted_at":"2011-09-16T16:58:01Z","abstract_excerpt":"Chandra LETG+HRC-S and XMM-Newton RGS spectra of H-like C and N formed in the corona of the lambda And primary star, a mildly metal-poor G8 III-IV first ascent giant that completed dredge-up ~50 Myr ago, have been used to make a precise measurement of its surface C/N ratio. We obtain the formal result [C/N]=0.03+/-0.07, which is typical of old disk giants and in agreement with standard dredge-up theory for stars of about 1 M_sun or lower. In contrast, these stars as a group, including lambda And, have 12C/13C ~< 20, which is much lower than standard model predictions. We show that the abundanc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3663","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":"2026-05-18T02:00:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nY/3x8EbeEtI2MaEYPYX90UL0l6CMlU+F/BV04xQl6IAMmb7nGzkkDsaymueNq3M1z3pHUG7No6rlDy7BPrdDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T16:10:16.978371Z"},"content_sha256":"c37dcc36e416b22d7f379b8b9bf87b3203b2eeeb93e2a948ffe3c08b84231285","schema_version":"1.0","event_id":"sha256:c37dcc36e416b22d7f379b8b9bf87b3203b2eeeb93e2a948ffe3c08b84231285"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/bundle.json","state_url":"https://pith.science/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/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":"2026-06-03T16:10:16Z","links":{"resolver":"https://pith.science/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S","bundle":"https://pith.science/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/bundle.json","state":"https://pith.science/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZPUNFJSSNPURNAXVXPIQMEFK2S/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:ZPUNFJSSNPURNAXVXPIQMEFK2S","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":"9ef03a3ab6d0c9e8bb29f167dccc1f1860f7d3ab9c905bed6846fda301a7ea3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-09-16T16:58:01Z","title_canon_sha256":"098b5cf3c9b7b1ed6964c021c16c3f15aaed2da537c3cbfc57558edd2101cdbb"},"schema_version":"1.0","source":{"id":"1109.3663","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.3663","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"arxiv_version","alias_value":"1109.3663v1","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.3663","created_at":"2026-05-18T02:00:31Z"},{"alias_kind":"pith_short_12","alias_value":"ZPUNFJSSNPUR","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"ZPUNFJSSNPURNAXV","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"ZPUNFJSS","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:c37dcc36e416b22d7f379b8b9bf87b3203b2eeeb93e2a948ffe3c08b84231285","target":"graph","created_at":"2026-05-18T02:00:31Z","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":"Chandra LETG+HRC-S and XMM-Newton RGS spectra of H-like C and N formed in the corona of the lambda And primary star, a mildly metal-poor G8 III-IV first ascent giant that completed dredge-up ~50 Myr ago, have been used to make a precise measurement of its surface C/N ratio. We obtain the formal result [C/N]=0.03+/-0.07, which is typical of old disk giants and in agreement with standard dredge-up theory for stars of about 1 M_sun or lower. In contrast, these stars as a group, including lambda And, have 12C/13C ~< 20, which is much lower than standard model predictions. We show that the abundanc","authors_text":"B. Ball, J.J. Drake, John J. Eldridge, J.-U. Ness, Richard J. Stancliffe","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-09-16T16:58:01Z","title":"Close to the Dredge: Precise X-ray C and N Abundances in lambda Andromeda and its Precocious RGB Mixing Problem"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.3663","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:a215c5284eb50db2c4cab383ac8b4e5fd561e2c7d964cddd1ddafaf3696c883a","target":"record","created_at":"2026-05-18T02:00:31Z","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":"9ef03a3ab6d0c9e8bb29f167dccc1f1860f7d3ab9c905bed6846fda301a7ea3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-09-16T16:58:01Z","title_canon_sha256":"098b5cf3c9b7b1ed6964c021c16c3f15aaed2da537c3cbfc57558edd2101cdbb"},"schema_version":"1.0","source":{"id":"1109.3663","kind":"arxiv","version":1}},"canonical_sha256":"cbe8d2a6526be91682f5bbd10610aad492b4d7adfa6850be65bd424bd350572c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cbe8d2a6526be91682f5bbd10610aad492b4d7adfa6850be65bd424bd350572c","first_computed_at":"2026-05-18T02:00:31.756974Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:31.756974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cjo0+3a56RwOtRT1VFqSeiKOg/rgU4+rYTvlGqCp9+Dh+WaceCHFd/g353JOhaCQ7SW8N1ixFoadzWJijPMUDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:31.757701Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.3663","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a215c5284eb50db2c4cab383ac8b4e5fd561e2c7d964cddd1ddafaf3696c883a","sha256:c37dcc36e416b22d7f379b8b9bf87b3203b2eeeb93e2a948ffe3c08b84231285"],"state_sha256":"ea1800cfaef85713db6e0012cfed6b964187e7f3262a211a2016bc78a44844de"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NloQQo7HVltGQ1Ya51ZZ/KhwILKkO3Pd1skPiwTC4tgPRVqGDh//OLil5UKUMeFFhius0U6Gub8PZBnXEpyaBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T16:10:16.980414Z","bundle_sha256":"636dc2b2d35d2d34f90359dcfbf47e5b87020f8cb2239fdc20db51b6c3f9d2e3"}}