{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:WOUC2VL2WBVDUEE5NDXHCYQSVK","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":"66715cf1cec42eca7ab6ee2f3cc486df415cdc41932c1569f3d2950494ebdc15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-17T11:51:33Z","title_canon_sha256":"c22eddb28bba1e7b2be0a590f3ab8060933c91a7e3160f147a4abff1ffd14ac0"},"schema_version":"1.0","source":{"id":"1612.05739","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.05739","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"arxiv_version","alias_value":"1612.05739v1","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.05739","created_at":"2026-05-18T00:52:37Z"},{"alias_kind":"pith_short_12","alias_value":"WOUC2VL2WBVD","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_16","alias_value":"WOUC2VL2WBVDUEE5","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_8","alias_value":"WOUC2VL2","created_at":"2026-05-18T12:30:51Z"}],"graph_snapshots":[{"event_id":"sha256:2afc983504f9a7bd91fa5826ebd267fed1ca6002d7e661cd2cf42babe0464297","target":"graph","created_at":"2026-05-18T00:52:37Z","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 the chemical abundance analysis of 19 upper main-sequence stars of the young open cluster NGC 6250 (log t ~ 7.42 yr). This work is part of a project aimed at setting observational constraints on the theory of atomic diffusion in stellar photospheres, by means of a systematic study of the abundances of the chemical elements of early F-, A- and late B-type stars of well-determined age. Our data set consists of low-, medium- and high-resolution spectra obtained with the Fibre Large Array Multi Element Spectrograph (FLAMES) instrument of the ESO Very Large Telescope (VLT). To perform ou","authors_text":"A. J. Martin, B. Smalley, C. Scalia, F. Leone, L. Fossati, M. J. Stift, S. Bagnulo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-17T11:51:33Z","title":"A spectroscopic study of the open cluster NGC 6250"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.05739","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":"sha256:7be7020669fc02871ab5dc07aeb8433a4ff532a7b5769791993a4c9099b66b23","target":"record","created_at":"2026-05-18T00:52:37Z","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":"66715cf1cec42eca7ab6ee2f3cc486df415cdc41932c1569f3d2950494ebdc15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-12-17T11:51:33Z","title_canon_sha256":"c22eddb28bba1e7b2be0a590f3ab8060933c91a7e3160f147a4abff1ffd14ac0"},"schema_version":"1.0","source":{"id":"1612.05739","kind":"arxiv","version":1}},"canonical_sha256":"b3a82d557ab06a3a109d68ee716212aabef95f439460f27243963904dbeeb143","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b3a82d557ab06a3a109d68ee716212aabef95f439460f27243963904dbeeb143","first_computed_at":"2026-05-18T00:52:37.171433Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:37.171433Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KpsQ/q1iO4SjgEHgC+Pi2+6W6MXktzNw+KtDYbPSJwEKfua0ix9cN+ieLbTKJQHbQBCB005Gj9H9qrRu2gIoAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:37.171897Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.05739","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7be7020669fc02871ab5dc07aeb8433a4ff532a7b5769791993a4c9099b66b23","sha256:2afc983504f9a7bd91fa5826ebd267fed1ca6002d7e661cd2cf42babe0464297"],"state_sha256":"91a3d21f35e8daee204b9f310375768fb13d6602ec87da9f6553ba59cc719552"}