{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:DSXJIR6JI7QWVEQFQCXQIYNHEW","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":"f7bf2b3f2926c740d23ecc2c5dc0c9bde85b1459c52489221801e7c50473644a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-06T20:00:05Z","title_canon_sha256":"64b633bc6afd312b88c4c45be0805dd88a8509e37b1ab09b4463866efcadc6fa"},"schema_version":"1.0","source":{"id":"0907.1082","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.1082","created_at":"2026-07-04T17:17:00Z"},{"alias_kind":"arxiv_version","alias_value":"0907.1082v2","created_at":"2026-07-04T17:17:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.1082","created_at":"2026-07-04T17:17:00Z"},{"alias_kind":"pith_short_12","alias_value":"DSXJIR6JI7QW","created_at":"2026-07-04T17:17:00Z"},{"alias_kind":"pith_short_16","alias_value":"DSXJIR6JI7QWVEQF","created_at":"2026-07-04T17:17:00Z"},{"alias_kind":"pith_short_8","alias_value":"DSXJIR6J","created_at":"2026-07-04T17:17:00Z"}],"graph_snapshots":[{"event_id":"sha256:b70f352b07219cdaf1cf094f190d1d092850b4cae1ccd2e7f2317c928068acab","target":"graph","created_at":"2026-07-04T17:17:00Z","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/0907.1082/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We determine photometric metal abundance estimates for individual main-sequence stars in the Virgo Overdensity (VOD), which covers almost 1000 deg^2 on the sky, based on a calibration of the metallicity sensitivity of stellar isochrones in the gri filter passbands using field stars with well-determined spectroscopic metal abundances. Despite the low precision of the method for individual stars, we derive [Fe/H] = -2.0 +/-0.1 (internal) +/-0.5 (systematic) for the metal abundance of the VOD from photometric measurements of 0.7 million stars in the Northern Galactic hemisphere with heliocentric ","authors_text":"Brian Yanny, Deokkeun An, Donald M. Terndrup, Franck Delahaye, Jennifer A. Johnson, Marc H. Pinsonneault, Thomas Masseron, Timothy C. Beers, Young Sun Lee","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-06T20:00:05Z","title":"A Photometric Metallicity Estimate of the Virgo Stellar Overdensity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.1082","kind":"arxiv","version":2},"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":"sha256:9cce6f6310bbf670407e63b6e8aa41e3c4ccbf9a240ee4688eb8382abcb0326e","target":"record","created_at":"2026-07-04T17:17:00Z","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":"f7bf2b3f2926c740d23ecc2c5dc0c9bde85b1459c52489221801e7c50473644a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-07-06T20:00:05Z","title_canon_sha256":"64b633bc6afd312b88c4c45be0805dd88a8509e37b1ab09b4463866efcadc6fa"},"schema_version":"1.0","source":{"id":"0907.1082","kind":"arxiv","version":2}},"canonical_sha256":"1cae9447c947e16a920580af0461a725b4d318cad5e3333f203ba8e16cd11cf3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1cae9447c947e16a920580af0461a725b4d318cad5e3333f203ba8e16cd11cf3","first_computed_at":"2026-07-04T17:17:00.837495Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:17:00.837495Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bo1BKZFlYoUlbXGmC6AYU1xrjgWMbj6uvoGUer+mO0/2kSyxqBjDpVv9d5cMBkSCIgCCDNrWJ767S2+BKLoRBg==","signature_status":"signed_v1","signed_at":"2026-07-04T17:17:00.837970Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.1082","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9cce6f6310bbf670407e63b6e8aa41e3c4ccbf9a240ee4688eb8382abcb0326e","sha256:b70f352b07219cdaf1cf094f190d1d092850b4cae1ccd2e7f2317c928068acab"],"state_sha256":"f5abf69517960e36b7e2a31c5867b79e69953ac2bce2dd85791dc444bb2e8351"}