{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:UGHGMHLHUC7EHYTRTEKSMTS3SW","short_pith_number":"pith:UGHGMHLH","canonical_record":{"source":{"id":"1909.04523","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-10T14:32:56Z","cross_cats_sorted":[],"title_canon_sha256":"c839d78186419738d6afdb30a059d8826acc6410ff3da9f20b585d11ff188fe2","abstract_canon_sha256":"8d0c65d11d0dfb830cc40ccad1e1859b0d243f795ce48ec2d34bef859e7bad84"},"schema_version":"1.0"},"canonical_sha256":"a18e661d67a0be43e2719915264e5b95928e99fc6c84cba855242d1a358729a1","source":{"kind":"arxiv","id":"1909.04523","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.04523","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.04523v1","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.04523","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_12","alias_value":"UGHGMHLHUC7E","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_16","alias_value":"UGHGMHLHUC7EHYTR","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_8","alias_value":"UGHGMHLH","created_at":"2026-07-05T00:10:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:UGHGMHLHUC7EHYTRTEKSMTS3SW","target":"record","payload":{"canonical_record":{"source":{"id":"1909.04523","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-10T14:32:56Z","cross_cats_sorted":[],"title_canon_sha256":"c839d78186419738d6afdb30a059d8826acc6410ff3da9f20b585d11ff188fe2","abstract_canon_sha256":"8d0c65d11d0dfb830cc40ccad1e1859b0d243f795ce48ec2d34bef859e7bad84"},"schema_version":"1.0"},"canonical_sha256":"a18e661d67a0be43e2719915264e5b95928e99fc6c84cba855242d1a358729a1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:10:43.750636Z","signature_b64":"zV8Vrp8qCZNf7e80nU4XbLKhtlHhZBOYWDjuCE0sXlBwmnzovsCJtHNZcky/2dJaxXiV1j86/dqwWo/HZZ1PDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a18e661d67a0be43e2719915264e5b95928e99fc6c84cba855242d1a358729a1","last_reissued_at":"2026-07-05T00:10:43.750254Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:10:43.750254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.04523","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":"2026-07-05T00:10:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZdkXuCIyVPukWJXjXZHAai9g5+g1x6RaTK78SIuTQ2UFJhNp+U4QOvBcKX+hiR0cs3RGvH0QTqSL1Y0qvEh5Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T11:07:10.478063Z"},"content_sha256":"11f53b54775f59ef9d598ebb917d51e31e671d250f77468b58c8a6ab05bc51a9","schema_version":"1.0","event_id":"sha256:11f53b54775f59ef9d598ebb917d51e31e671d250f77468b58c8a6ab05bc51a9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:UGHGMHLHUC7EHYTRTEKSMTS3SW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Li Evolution and the Open Cluster NGC 6819: A Correlation Between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"(2) Univ. of Kansas), B. A. Twarog (2) ((1) Indiana Univ., B. J. Anthony-Twarog (2), C. P. Deliyannis (1), D. B. Lee-Brown (2)","submitted_at":"2019-09-10T14:32:56Z","abstract_excerpt":"Spectroscopy of 333 NGC 6819 stars and Gaia astrometry are used to map Li evolution from the giant branch tip to 0.5 mag below the Li dip. Isochrone comparison with [Fe/H] = -0.04, based upon neural network spectroscopic analysis, produces an age of 2.25 (2.4) Gyr for E(B-V) = 0.16 (0.14) and (m-M) = 12.40 (12.29). Despite originating outside the Li dip, only 10% of single subgiants/giants have measurable Li. Above the Li dip, the limiting A(Li) for single stars is 3.2 +/- 0.1 but the lower range is comparable to that found within the dip. The F-dwarf Li dip profile agrees with the Hyades/Prae"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.04523","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.04523/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:10:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"12ms/tyAhbqB5rs36c85Z8Z5HEKy+yUUP5U4KjRyQpPXFC+ZY4WlYVaJf4s4+gLpOgAyKmxCG3+8jHdgYknTBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T11:07:10.478591Z"},"content_sha256":"3ed797b9de3c641a47bc4fad4ff397c985211ad617db3f80bf5e2d76452b680e","schema_version":"1.0","event_id":"sha256:3ed797b9de3c641a47bc4fad4ff397c985211ad617db3f80bf5e2d76452b680e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/bundle.json","state_url":"https://pith.science/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/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":"2026-08-11T11:07:10Z","links":{"resolver":"https://pith.science/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW","bundle":"https://pith.science/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/bundle.json","state":"https://pith.science/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UGHGMHLHUC7EHYTRTEKSMTS3SW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:UGHGMHLHUC7EHYTRTEKSMTS3SW","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":"8d0c65d11d0dfb830cc40ccad1e1859b0d243f795ce48ec2d34bef859e7bad84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-10T14:32:56Z","title_canon_sha256":"c839d78186419738d6afdb30a059d8826acc6410ff3da9f20b585d11ff188fe2"},"schema_version":"1.0","source":{"id":"1909.04523","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.04523","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"arxiv_version","alias_value":"1909.04523v1","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.04523","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_12","alias_value":"UGHGMHLHUC7E","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_16","alias_value":"UGHGMHLHUC7EHYTR","created_at":"2026-07-05T00:10:43Z"},{"alias_kind":"pith_short_8","alias_value":"UGHGMHLH","created_at":"2026-07-05T00:10:43Z"}],"graph_snapshots":[{"event_id":"sha256:3ed797b9de3c641a47bc4fad4ff397c985211ad617db3f80bf5e2d76452b680e","target":"graph","created_at":"2026-07-05T00:10:43Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.04523/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spectroscopy of 333 NGC 6819 stars and Gaia astrometry are used to map Li evolution from the giant branch tip to 0.5 mag below the Li dip. Isochrone comparison with [Fe/H] = -0.04, based upon neural network spectroscopic analysis, produces an age of 2.25 (2.4) Gyr for E(B-V) = 0.16 (0.14) and (m-M) = 12.40 (12.29). Despite originating outside the Li dip, only 10% of single subgiants/giants have measurable Li. Above the Li dip, the limiting A(Li) for single stars is 3.2 +/- 0.1 but the lower range is comparable to that found within the dip. The F-dwarf Li dip profile agrees with the Hyades/Prae","authors_text":"(2) Univ. of Kansas), B. A. Twarog (2) ((1) Indiana Univ., B. J. Anthony-Twarog (2), C. P. Deliyannis (1), D. B. Lee-Brown (2)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-10T14:32:56Z","title":"Li Evolution and the Open Cluster NGC 6819: A Correlation Between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.04523","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":"sha256:11f53b54775f59ef9d598ebb917d51e31e671d250f77468b58c8a6ab05bc51a9","target":"record","created_at":"2026-07-05T00:10:43Z","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":"8d0c65d11d0dfb830cc40ccad1e1859b0d243f795ce48ec2d34bef859e7bad84","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-09-10T14:32:56Z","title_canon_sha256":"c839d78186419738d6afdb30a059d8826acc6410ff3da9f20b585d11ff188fe2"},"schema_version":"1.0","source":{"id":"1909.04523","kind":"arxiv","version":1}},"canonical_sha256":"a18e661d67a0be43e2719915264e5b95928e99fc6c84cba855242d1a358729a1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a18e661d67a0be43e2719915264e5b95928e99fc6c84cba855242d1a358729a1","first_computed_at":"2026-07-05T00:10:43.750254Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:10:43.750254Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zV8Vrp8qCZNf7e80nU4XbLKhtlHhZBOYWDjuCE0sXlBwmnzovsCJtHNZcky/2dJaxXiV1j86/dqwWo/HZZ1PDg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:10:43.750636Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.04523","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:11f53b54775f59ef9d598ebb917d51e31e671d250f77468b58c8a6ab05bc51a9","sha256:3ed797b9de3c641a47bc4fad4ff397c985211ad617db3f80bf5e2d76452b680e"],"state_sha256":"f64ab43840426b6ce43461199172c35b5cee3e18970d1cad5dcfbf7bad6a8b08"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S1rueLQNOWrmh1vjkTMGT7E+E8OfUBuOiMLtp5uCdqKOfvICEbicY+v4N0sskD1Eg+gWd2wN7Axc9qtUGtviDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T11:07:10.483452Z","bundle_sha256":"18a68773ef30dd265c399d57394bc94cdb83b6b4ea0bd3bca87351ac618a5844"}}