{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:RV75RFJNVBICVUMYT65Y6TEP5X","short_pith_number":"pith:RV75RFJN","schema_version":"1.0","canonical_sha256":"8d7fd8952da8502ad1989fbb8f4c8feddc3c60455fc11ea7d8f5d03b0bc83be3","source":{"kind":"arxiv","id":"0906.3140","version":1},"attestation_state":"computed","paper":{"title":"On the metallicity gradient of the Galactic disk","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Piersimoni, A. Pietrinferni, B. Lemasle, D. Laney, F. Caputo, F. Castelli, F. Primas, G. Bono, J. Lub, J. Pritchard, J.W. Pel, M. Groenewegen, M. Romaniello, P. Francois, R. Buonanno, S. Cassisi, S. Leurini, S. Pedicelli","submitted_at":"2009-06-17T10:50:10Z","abstract_excerpt":"Aims: The iron abundance gradient in the Galactic stellar disk provides fundamental constraints on the chemical evolution of this important Galaxy component. However the spread around the mean slope is, at fixed Galactocentric distance, larger than estimated uncertainties. Methods: To provide quantitative constraints on these trends we adopted iron abundances for 265 classical Cepheids (more than 50% of the currently known sample) based either on high-resolution spectra or on photometric metallicity indices. Homogeneous distances were estimated using near-infrared Period-Luminosity relations. "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0906.3140","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-06-17T10:50:10Z","cross_cats_sorted":[],"title_canon_sha256":"f43937f240869a10bf6910f9c4d5f03c0368b6324360f4d1ad083e0dcc2b1c93","abstract_canon_sha256":"a2dee725991193fe9654a11b17986bc8beace4ffeb2549b5ec5bfe74fece1b6b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:19.487884Z","signature_b64":"qijb8ySJWyWY0I0OrbG1JCyWXkwr9ArNrWQyiSgN5mj0Qjp1dckwrk0S6cQ2YeM4CFfdUPfgPYfAasBRi3wuDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8d7fd8952da8502ad1989fbb8f4c8feddc3c60455fc11ea7d8f5d03b0bc83be3","last_reissued_at":"2026-05-18T02:13:19.487299Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:19.487299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the metallicity gradient of the Galactic disk","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Piersimoni, A. Pietrinferni, B. Lemasle, D. Laney, F. Caputo, F. Castelli, F. Primas, G. Bono, J. Lub, J. Pritchard, J.W. Pel, M. Groenewegen, M. Romaniello, P. Francois, R. Buonanno, S. Cassisi, S. Leurini, S. Pedicelli","submitted_at":"2009-06-17T10:50:10Z","abstract_excerpt":"Aims: The iron abundance gradient in the Galactic stellar disk provides fundamental constraints on the chemical evolution of this important Galaxy component. However the spread around the mean slope is, at fixed Galactocentric distance, larger than estimated uncertainties. Methods: To provide quantitative constraints on these trends we adopted iron abundances for 265 classical Cepheids (more than 50% of the currently known sample) based either on high-resolution spectra or on photometric metallicity indices. Homogeneous distances were estimated using near-infrared Period-Luminosity relations. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0906.3140","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"0906.3140","created_at":"2026-05-18T02:13:19.487422+00:00"},{"alias_kind":"arxiv_version","alias_value":"0906.3140v1","created_at":"2026-05-18T02:13:19.487422+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0906.3140","created_at":"2026-05-18T02:13:19.487422+00:00"},{"alias_kind":"pith_short_12","alias_value":"RV75RFJNVBIC","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_16","alias_value":"RV75RFJNVBICVUMY","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_8","alias_value":"RV75RFJN","created_at":"2026-05-18T12:26:01.383474+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X","json":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X.json","graph_json":"https://pith.science/api/pith-number/RV75RFJNVBICVUMYT65Y6TEP5X/graph.json","events_json":"https://pith.science/api/pith-number/RV75RFJNVBICVUMYT65Y6TEP5X/events.json","paper":"https://pith.science/paper/RV75RFJN"},"agent_actions":{"view_html":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X","download_json":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X.json","view_paper":"https://pith.science/paper/RV75RFJN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0906.3140&json=true","fetch_graph":"https://pith.science/api/pith-number/RV75RFJNVBICVUMYT65Y6TEP5X/graph.json","fetch_events":"https://pith.science/api/pith-number/RV75RFJNVBICVUMYT65Y6TEP5X/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X/action/storage_attestation","attest_author":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X/action/author_attestation","sign_citation":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X/action/citation_signature","submit_replication":"https://pith.science/pith/RV75RFJNVBICVUMYT65Y6TEP5X/action/replication_record"}},"created_at":"2026-05-18T02:13:19.487422+00:00","updated_at":"2026-05-18T02:13:19.487422+00:00"}