{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:ROKQ5Z7XPXENGC4V7P72LESLGM","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":"580b931911efcbf0d2ac711da13a1ab46308d57b1f44c2d7f8b744f73924e451","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-27T16:03:55Z","title_canon_sha256":"a7e1d5d19e0b90317927e435a0429adb456378bb253aa8942029fa0b44bfe545"},"schema_version":"1.0","source":{"id":"1902.10611","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.10611","created_at":"2026-05-17T23:51:29Z"},{"alias_kind":"arxiv_version","alias_value":"1902.10611v1","created_at":"2026-05-17T23:51:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.10611","created_at":"2026-05-17T23:51:29Z"},{"alias_kind":"pith_short_12","alias_value":"ROKQ5Z7XPXEN","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"ROKQ5Z7XPXENGC4V","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"ROKQ5Z7X","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:d26d3b27a74cff7ea845507aeadfe2f3b1e2f30707d62008b12f388154d70b0f","target":"graph","created_at":"2026-05-17T23:51:29Z","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 present results from the analysis of high-resolution spectra obtained with the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor (EMP) stars originally selected from commissioning data obtained with the SkyMapper telescope. Fourteen of the stars have not been observed previously at high dispersion. Three have [Fe/H]<=-3.0 while the remainder, with two more metal-rich exceptions, have -3.0<=[Fe/H]<=-2.0 dex. Apart from Fe, we also derive abundances for the elements C, N, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, and Zn, and for n-capture elements Sr, Ba, and Eu. Non","authors_text":"A. D. Mackey, A. F. Marino, A. Frebel, A. R. Casey, B. P. Schmidt, D. Yong, G. S. Da Costa, J. E. Norris, K. Lind, M. Asplund, M. S. Bessell, S. C. Keller, S. J. Murphy, T. Nordlander","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-27T16:03:55Z","title":"Keck HIRES Spectroscopy of SkyMapper Commissioning Survey Candidate Extremely Metal-Poor Stars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.10611","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":"sha256:1cbd9932ebb8618b906a0a91090aabc8d72a8eeb7afe0ade368f12162dc21a2b","target":"record","created_at":"2026-05-17T23:51:29Z","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":"580b931911efcbf0d2ac711da13a1ab46308d57b1f44c2d7f8b744f73924e451","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-27T16:03:55Z","title_canon_sha256":"a7e1d5d19e0b90317927e435a0429adb456378bb253aa8942029fa0b44bfe545"},"schema_version":"1.0","source":{"id":"1902.10611","kind":"arxiv","version":1}},"canonical_sha256":"8b950ee7f77dc8d30b95fbffa5924b330edc549ffebff4bc540b12d410ee2165","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8b950ee7f77dc8d30b95fbffa5924b330edc549ffebff4bc540b12d410ee2165","first_computed_at":"2026-05-17T23:51:29.832928Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:29.832928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x3OlsmyI4xNRuh14XVFEN4520S+V+1Y3EHrnEYCNxHiDUjBqH7AnvdtqbPnPgeXq56tYvFOS9fVImR46L29fCA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:29.833415Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.10611","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1cbd9932ebb8618b906a0a91090aabc8d72a8eeb7afe0ade368f12162dc21a2b","sha256:d26d3b27a74cff7ea845507aeadfe2f3b1e2f30707d62008b12f388154d70b0f"],"state_sha256":"d6cebe0d70ae860a3f0379bcc6d7a62e9a55e939f4389e27a04add97eb4f4667"}