{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:ZS2UHSVEI4WJZYTY45L2FJSDT2","short_pith_number":"pith:ZS2UHSVE","canonical_record":{"source":{"id":"1210.6387","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-10-23T21:35:27Z","cross_cats_sorted":[],"title_canon_sha256":"7e68166e557652b9a2849912ed5a7957d934410f6c625c4105b62d719f13090d","abstract_canon_sha256":"c4e255a3a9e5ef375d35bd1d44e1b182911db1878b586228db44fa0ae56ad9fd"},"schema_version":"1.0"},"canonical_sha256":"ccb543caa4472c9ce278e757a2a6439eae02e998b746235a50c39a1b11b8fd2e","source":{"kind":"arxiv","id":"1210.6387","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.6387","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"arxiv_version","alias_value":"1210.6387v1","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.6387","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"pith_short_12","alias_value":"ZS2UHSVEI4WJ","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"ZS2UHSVEI4WJZYTY","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"ZS2UHSVE","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:ZS2UHSVEI4WJZYTY45L2FJSDT2","target":"record","payload":{"canonical_record":{"source":{"id":"1210.6387","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-10-23T21:35:27Z","cross_cats_sorted":[],"title_canon_sha256":"7e68166e557652b9a2849912ed5a7957d934410f6c625c4105b62d719f13090d","abstract_canon_sha256":"c4e255a3a9e5ef375d35bd1d44e1b182911db1878b586228db44fa0ae56ad9fd"},"schema_version":"1.0"},"canonical_sha256":"ccb543caa4472c9ce278e757a2a6439eae02e998b746235a50c39a1b11b8fd2e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:53:43.997557Z","signature_b64":"G/N9zMQ/PAdoMJsz3Mel5K47M3JWqwmObk4PKOY0bPwnKJ+RVUtbINq232hJ2UdY7X8vR18EdIddrTliUxFRAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ccb543caa4472c9ce278e757a2a6439eae02e998b746235a50c39a1b11b8fd2e","last_reissued_at":"2026-05-18T01:53:43.996976Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:53:43.996976Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1210.6387","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":"2026-05-18T01:53:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l8EiigoUa+YeiQLf71QCmDrm6/jFB8FqgDSG5cIY2rp0e6cOktLI44lk1542SSaM41E4DaAAz4MfTQ6DbTgEBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T14:36:17.545382Z"},"content_sha256":"dd89990d0b89a76ae32684a7e3d3e1c7df3585a47aabf6476fdfbe81f93ced90","schema_version":"1.0","event_id":"sha256:dd89990d0b89a76ae32684a7e3d3e1c7df3585a47aabf6476fdfbe81f93ced90"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:ZS2UHSVEI4WJZYTY45L2FJSDT2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Anna Frebel, Christopher Sneden, Hendrik Schatz, Ian B. Thompson, Ian U. Roederer, Inese I. Ivans, James E. Lawler, Jennifer S. Sobeck, John J. Cowan, Timothy C. Beers","submitted_at":"2012-10-23T21:35:27Z","abstract_excerpt":"Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, can only be detected in the near-ultraviolet. We report the results of an observing campaign using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to study the detailed heavy element abundance patterns in four metal-poor stars. We derive abundances or upper limits from 27 absorption lines of 15 elements produced by neutron-capture reactions, including seven elements (germanium, cadmium, tel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.6387","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":"2026-05-18T01:53:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8mFGe3r7y94xY+DtTyKqLwSHYhO6NyjSVXJIhtFmeO0BWEd7qFCZzRMsYgRqx9GY/aCyBvpfDbgJmb9SC0aJDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T14:36:17.546044Z"},"content_sha256":"6e321eeae813d07922ab5eb8f65fd6fc06b6f3732a25a71e7005d4104bc30e3d","schema_version":"1.0","event_id":"sha256:6e321eeae813d07922ab5eb8f65fd6fc06b6f3732a25a71e7005d4104bc30e3d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/bundle.json","state_url":"https://pith.science/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/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":"2026-05-30T14:36:17Z","links":{"resolver":"https://pith.science/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2","bundle":"https://pith.science/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/bundle.json","state":"https://pith.science/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZS2UHSVEI4WJZYTY45L2FJSDT2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ZS2UHSVEI4WJZYTY45L2FJSDT2","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":"c4e255a3a9e5ef375d35bd1d44e1b182911db1878b586228db44fa0ae56ad9fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-10-23T21:35:27Z","title_canon_sha256":"7e68166e557652b9a2849912ed5a7957d934410f6c625c4105b62d719f13090d"},"schema_version":"1.0","source":{"id":"1210.6387","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.6387","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"arxiv_version","alias_value":"1210.6387v1","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.6387","created_at":"2026-05-18T01:53:43Z"},{"alias_kind":"pith_short_12","alias_value":"ZS2UHSVEI4WJ","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"ZS2UHSVEI4WJZYTY","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"ZS2UHSVE","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:6e321eeae813d07922ab5eb8f65fd6fc06b6f3732a25a71e7005d4104bc30e3d","target":"graph","created_at":"2026-05-18T01:53:43Z","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":"Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, can only be detected in the near-ultraviolet. We report the results of an observing campaign using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to study the detailed heavy element abundance patterns in four metal-poor stars. We derive abundances or upper limits from 27 absorption lines of 15 elements produced by neutron-capture reactions, including seven elements (germanium, cadmium, tel","authors_text":"Anna Frebel, Christopher Sneden, Hendrik Schatz, Ian B. Thompson, Ian U. Roederer, Inese I. Ivans, James E. Lawler, Jennifer S. Sobeck, John J. Cowan, Timothy C. Beers","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-10-23T21:35:27Z","title":"New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.6387","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:dd89990d0b89a76ae32684a7e3d3e1c7df3585a47aabf6476fdfbe81f93ced90","target":"record","created_at":"2026-05-18T01:53:43Z","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":"c4e255a3a9e5ef375d35bd1d44e1b182911db1878b586228db44fa0ae56ad9fd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-10-23T21:35:27Z","title_canon_sha256":"7e68166e557652b9a2849912ed5a7957d934410f6c625c4105b62d719f13090d"},"schema_version":"1.0","source":{"id":"1210.6387","kind":"arxiv","version":1}},"canonical_sha256":"ccb543caa4472c9ce278e757a2a6439eae02e998b746235a50c39a1b11b8fd2e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ccb543caa4472c9ce278e757a2a6439eae02e998b746235a50c39a1b11b8fd2e","first_computed_at":"2026-05-18T01:53:43.996976Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:53:43.996976Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G/N9zMQ/PAdoMJsz3Mel5K47M3JWqwmObk4PKOY0bPwnKJ+RVUtbINq232hJ2UdY7X8vR18EdIddrTliUxFRAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:53:43.997557Z","signed_message":"canonical_sha256_bytes"},"source_id":"1210.6387","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd89990d0b89a76ae32684a7e3d3e1c7df3585a47aabf6476fdfbe81f93ced90","sha256:6e321eeae813d07922ab5eb8f65fd6fc06b6f3732a25a71e7005d4104bc30e3d"],"state_sha256":"52750e0e918b972f12ed93a65049dfb62e24e804dfc2f4e74496f67e10c8d254"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fehK4vNJLt663rEsiO1A51y6A3lq8Rn8q2u2M12F2gyg+888sKBz1fP80/m97+s9S7iGTFxizlxHOh6WGWlQDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T14:36:17.549421Z","bundle_sha256":"c59a6ae19e6b3cada170ca954a1d5a0e1a92cbf72d4139767f76ca3ce1fc555f"}}