{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:PT4IBXU5OS6SNCO5IUSHOHUBFX","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":"07de08a0dba883843148056473aee743420d31ef4e1e79edd3a83abef000cac3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-11-11T22:09:34Z","title_canon_sha256":"77760f5f132859f9448a4e429f2486e41a9135f61a6674d382060c7ea1c908b7"},"schema_version":"1.0","source":{"id":"astro-ph/9911217","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9911217","created_at":"2026-07-04T16:11:53Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9911217v1","created_at":"2026-07-04T16:11:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9911217","created_at":"2026-07-04T16:11:53Z"},{"alias_kind":"pith_short_12","alias_value":"PT4IBXU5OS6S","created_at":"2026-07-04T16:11:53Z"},{"alias_kind":"pith_short_16","alias_value":"PT4IBXU5OS6SNCO5","created_at":"2026-07-04T16:11:53Z"},{"alias_kind":"pith_short_8","alias_value":"PT4IBXU5","created_at":"2026-07-04T16:11:53Z"}],"graph_snapshots":[{"event_id":"sha256:6d355514dfa10eb7666a5e5591a00b9279f32f2fbb72d61d8ab498bad9f45212","target":"graph","created_at":"2026-07-04T16:11:53Z","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/astro-ph/9911217/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Isotopic abundance ratios 24^Mg:25^Mg:26^Mg are derived for 20 stars from high- resolution spectra of the MgH A-X 0-0 band at 5140AA. With the exception of the weak g-band giant HR 1299, the stars are dwarfs that sample the metallicity range -1.8 < [Fe/H] <0.0. The abundance of 25^Mg amd 26^Mg relative to the dominant isotope 24^Mg decreases with decreasing [Fe/H] in fair accord with predictions from a recent model of galactic chemical evolution in which the Mg isotopes are synthesised by massive stars. Several stars appear especially enriched in the heavier Mg isotopes suggesting contaminatio","authors_text":"David L. Lambert (University of Texas at Austin), Pamela Gay","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-11-11T22:09:34Z","title":"The Isotopic Abundances of Magnesium in Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9911217","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:e1ffb7d847b39dce9c472b1fe7d36182f608cc12661bb67fc1c99afb40b7e498","target":"record","created_at":"2026-07-04T16:11:53Z","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":"07de08a0dba883843148056473aee743420d31ef4e1e79edd3a83abef000cac3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-11-11T22:09:34Z","title_canon_sha256":"77760f5f132859f9448a4e429f2486e41a9135f61a6674d382060c7ea1c908b7"},"schema_version":"1.0","source":{"id":"astro-ph/9911217","kind":"arxiv","version":1}},"canonical_sha256":"7cf880de9d74bd2689dd4524771e812decd361d44d3bff2b3fc0dcfc0ded63b0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7cf880de9d74bd2689dd4524771e812decd361d44d3bff2b3fc0dcfc0ded63b0","first_computed_at":"2026-07-04T16:11:53.961850Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:11:53.961850Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tSKohpAl5yqTcaG3ofzW6yNtK4/dp9jL+dwVSwmX/wwgUl4zwLIyifqqd12yRAEZTFsA0aWeTE+4pJ8ZLNmkAg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:11:53.962231Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9911217","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e1ffb7d847b39dce9c472b1fe7d36182f608cc12661bb67fc1c99afb40b7e498","sha256:6d355514dfa10eb7666a5e5591a00b9279f32f2fbb72d61d8ab498bad9f45212"],"state_sha256":"d4fbe1de774ba0f9bddf3c641e706e8ae2013ac38527ce1018ff0d79a2793990"}