{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:OG4PKITBHVUMMW5IL5UNO7KVK2","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":"a2c14e266e57c013a163b14e76ddb81dd4effcb54fe3c5d6bc1b8d01149e67dc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-22T16:56:03Z","title_canon_sha256":"86b333fa2aca3bced5030b5847ee05d6f67415d01f070c9a80f4b81a36cbd9f7"},"schema_version":"1.0","source":{"id":"1201.4571","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.4571","created_at":"2026-05-18T01:58:43Z"},{"alias_kind":"arxiv_version","alias_value":"1201.4571v1","created_at":"2026-05-18T01:58:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.4571","created_at":"2026-05-18T01:58:43Z"},{"alias_kind":"pith_short_12","alias_value":"OG4PKITBHVUM","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"OG4PKITBHVUMMW5I","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"OG4PKITB","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:9a502663b64a27db36a0bb11c0c62238c422687a37175f6accf117074ffdfe91","target":"graph","created_at":"2026-05-18T01:58:43Z","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":"In this paper we present a new method for selecting blue horizontal branch (BHB) candidates based on color-color photometry. We make use of the Sloan Digital Sky Survey z band as a surface gravity indicator and show its value for selecting BHB stars from quasars, white dwarfs and main sequence A type stars. Using the g, r, i, and z bands, we demonstrate that extraction accuracies on par with more traditional u, g, and r photometric selection methods may be achieved. We also show that the completeness necessary to probe major Galactic structure may be maintained. Our new method allows us to eff","authors_text":"Avon P. Huxor, Eva K. Grebel, John J. Vickers","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-22T16:56:03Z","title":"Identifying Blue Horizontal Branch Stars Using the z Filter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.4571","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":"sha256:7469a16ac98277d9b9ef9b57eb53143aba7e9a74b8999d98fdda9c1e5e7b4ae7","target":"record","created_at":"2026-05-18T01:58:43Z","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":"a2c14e266e57c013a163b14e76ddb81dd4effcb54fe3c5d6bc1b8d01149e67dc","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2012-01-22T16:56:03Z","title_canon_sha256":"86b333fa2aca3bced5030b5847ee05d6f67415d01f070c9a80f4b81a36cbd9f7"},"schema_version":"1.0","source":{"id":"1201.4571","kind":"arxiv","version":1}},"canonical_sha256":"71b8f522613d68c65ba85f68d77d5556a34daa2567472f81688579b1aa1eeed5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"71b8f522613d68c65ba85f68d77d5556a34daa2567472f81688579b1aa1eeed5","first_computed_at":"2026-05-18T01:58:43.828765Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:43.828765Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h0zYOJ4R53hq+2kPcoOjYNO0lK++Er4UORFjgJ5QbuZM1DfMu0zLWjMwxgIKPCMo/YkCoY9CVWfSIsO+lyS3Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:43.829405Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.4571","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7469a16ac98277d9b9ef9b57eb53143aba7e9a74b8999d98fdda9c1e5e7b4ae7","sha256:9a502663b64a27db36a0bb11c0c62238c422687a37175f6accf117074ffdfe91"],"state_sha256":"32928daf7d53962d3c27b68ba81f0ee0e3d15ce691248cd45824dc90ce63aad1"}