{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:FHYOZHGGMB6RSE7X3F2L6IEJYQ","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":"ed6df87474077c871cde5bf30f3a3bb1b11a3b28a82b58d004eb348dacba69bd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-01-06T10:27:10Z","title_canon_sha256":"8d2481d15dd20940ab99e1c0082d6c89313174f2e5a1a11b340d304f4a4182d2"},"schema_version":"1.0","source":{"id":"0901.0617","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.0617","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"arxiv_version","alias_value":"0901.0617v1","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.0617","created_at":"2026-05-18T04:29:24Z"},{"alias_kind":"pith_short_12","alias_value":"FHYOZHGGMB6R","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"FHYOZHGGMB6RSE7X","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"FHYOZHGG","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:e24f3f460695b85f0f55405df6913f9147b12c7c514028f237c909e790fbf284","target":"graph","created_at":"2026-05-18T04:29:24Z","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":"We exploit the recent observations of extremely metal-poor (EMP) stars in the Galactic halo and investigate the constraints on the IMF of the stellar population that left these low-mass survivors of [Fe/H]<-2.5 and the chemical evolution that they took part in. A high-mass IMF with the typical mass~10Msun and the overwhelming contribution of low-mass members of binaries to the EMP survivors are derived from the statistics of carbon-enriched EMP stars with and without the enhancement of s-process elements (Komiya et al. 2007). We first examine the analysis to confirm their results for various a","authors_text":"Masayuki Y. Fujimoto, Takuma Suda, Yutaka Komiya","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-01-06T10:27:10Z","title":"Early-Age Evolution of the Milky Way Related by Extremely Metal-Poor Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.0617","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":"sha256:3209be077db82a58d56aba94d2d64dd6edfaa2ede3ba5a0ff803b860442061d4","target":"record","created_at":"2026-05-18T04:29:24Z","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":"ed6df87474077c871cde5bf30f3a3bb1b11a3b28a82b58d004eb348dacba69bd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-01-06T10:27:10Z","title_canon_sha256":"8d2481d15dd20940ab99e1c0082d6c89313174f2e5a1a11b340d304f4a4182d2"},"schema_version":"1.0","source":{"id":"0901.0617","kind":"arxiv","version":1}},"canonical_sha256":"29f0ec9cc6607d1913f7d974bf2089c40b63ecca8d2b3c93f7efc4f6a3221f99","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"29f0ec9cc6607d1913f7d974bf2089c40b63ecca8d2b3c93f7efc4f6a3221f99","first_computed_at":"2026-05-18T04:29:24.152331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:24.152331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nPf9Zm17zF0x4BR9oGjssGbFbrvPfu9Ush3yF4ld7erfUDg0NXHVWGuTZid/6bTIORbAfmBOrRLIZVl5FfCwAw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:24.153014Z","signed_message":"canonical_sha256_bytes"},"source_id":"0901.0617","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3209be077db82a58d56aba94d2d64dd6edfaa2ede3ba5a0ff803b860442061d4","sha256:e24f3f460695b85f0f55405df6913f9147b12c7c514028f237c909e790fbf284"],"state_sha256":"6cffa8e07898e034efeba871da937e2201ad02900dd7fc7c3076d37e65a5217a"}