{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2005:AJRNA3YIIQUYKX6DRH4PJNSIYM","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":"342233e78c6507576dc4490ac2a237e316340e3f54786b4075128989457e0713","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-10-18T15:04:24Z","title_canon_sha256":"fb6547d8c8b17a2c17209786dc756d1670042ff06a7da7a6d690eecce1e24725"},"schema_version":"1.0","source":{"id":"astro-ph/0510521","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0510521","created_at":"2026-05-18T04:33:50Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0510521v1","created_at":"2026-05-18T04:33:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0510521","created_at":"2026-05-18T04:33:50Z"},{"alias_kind":"pith_short_12","alias_value":"AJRNA3YIIQUY","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_16","alias_value":"AJRNA3YIIQUYKX6D","created_at":"2026-05-18T12:25:53Z"},{"alias_kind":"pith_short_8","alias_value":"AJRNA3YI","created_at":"2026-05-18T12:25:53Z"}],"graph_snapshots":[{"event_id":"sha256:65cec241d65da10f7825d90e14d3aff46ea8ce0b40f7bb974114c44ffac17fca","target":"graph","created_at":"2026-05-18T04:33:50Z","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 have assessed the influence of the stellar iron content on the Cepheid Period-Luminosity (PL) relation by relating the V band residuals from the Freedman et al (2001) PL relation to [Fe/H] for 68 Galactic and Magellanic Cloud Cepheids. The iron abundances were measured from FEROS and UVES high-resolution and high signal-to-noise optical spectra. Our data indicate that the stars become fainter as metallicity increases, until a plateau or turnover point is reached at about solar metallicity. This behavior appears at odds both with the PL relation being independent from iron abundance and with","authors_text":"F.Primas, G. Bono, M. Groenewegen, M. Mottini, M. Romaniello, P. Francois","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2005-10-18T15:04:24Z","title":"The Metallicity Dependence of the Cepheid Period-Luminosity Relation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0510521","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:e30737d7b602fa9921a1ad0c91e997769f1bd19b9491060f52e3c9bc042a0387","target":"record","created_at":"2026-05-18T04:33:50Z","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":"342233e78c6507576dc4490ac2a237e316340e3f54786b4075128989457e0713","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2005-10-18T15:04:24Z","title_canon_sha256":"fb6547d8c8b17a2c17209786dc756d1670042ff06a7da7a6d690eecce1e24725"},"schema_version":"1.0","source":{"id":"astro-ph/0510521","kind":"arxiv","version":1}},"canonical_sha256":"0262d06f084429855fc389f8f4b648c330adccabb743540b98aede6b19f851b3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0262d06f084429855fc389f8f4b648c330adccabb743540b98aede6b19f851b3","first_computed_at":"2026-05-18T04:33:50.650532Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:33:50.650532Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oE3q4AL5k5eR3mqfDQeWMPIwOALythIqn2bK6tLAQIakBWUMn93QXoiejyGOMzM5JjLfV2LQirlhpjJeSYVRBA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:33:50.651161Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0510521","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e30737d7b602fa9921a1ad0c91e997769f1bd19b9491060f52e3c9bc042a0387","sha256:65cec241d65da10f7825d90e14d3aff46ea8ce0b40f7bb974114c44ffac17fca"],"state_sha256":"2ce7313429c46d3009a380bb5e7a74db244e557eb2b6a7bf952b76e1ba766dc9"}