{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:FPRD52ZKOXOSD3I3I6AFNNUMOX","short_pith_number":"pith:FPRD52ZK","schema_version":"1.0","canonical_sha256":"2be23eeb2a75dd21ed1b478056b68c75d951589d217083493aa4f9598e2b6026","source":{"kind":"arxiv","id":"1812.00685","version":1},"attestation_state":"computed","paper":{"title":"Search for a metallicity spread in the multiple population Large Magellanic Cloud cluster NGC 1978","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andr\\'es E. Piatti, Jeremy Bailin","submitted_at":"2018-12-03T11:45:39Z","abstract_excerpt":"We report on the spread of [Fe/H] values in the massive Large Magellanic Cloud cluster NGC1978, recently confirmed to harbor multiple populations of nearly the same age. We used accurate Stromgren photometry of carefully selected cluster red giant branch stars along with a high-dispersion spectroscopy-based calibration of the metallicity-sensitive index m1. Once accounting for the photometry quality, assessed from extensive artificial stars tests to trace the photometric uncertainties as a function of the position to the cluster's center as well as the stellar brightness, and those from the me"},"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":"1812.00685","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-12-03T11:45:39Z","cross_cats_sorted":[],"title_canon_sha256":"4c222a3d89c8bbad2239cf47a7f7e193579e4d9a7769ee06a44b2869c1c1c9de","abstract_canon_sha256":"54096cc46609f6e4062ea9c20f4c26042897430b9e2cf5867b5217e435482a91"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:53.645641Z","signature_b64":"OiM4OejKRnxMPSj9vkZDcgYDo71OL28bgXSKwDtCoVZIubsfXIRyRmZva4UgWXG24Py2udL2/6ZSIUZjTrIjAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2be23eeb2a75dd21ed1b478056b68c75d951589d217083493aa4f9598e2b6026","last_reissued_at":"2026-05-17T23:55:53.644833Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:53.644833Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Search for a metallicity spread in the multiple population Large Magellanic Cloud cluster NGC 1978","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andr\\'es E. Piatti, Jeremy Bailin","submitted_at":"2018-12-03T11:45:39Z","abstract_excerpt":"We report on the spread of [Fe/H] values in the massive Large Magellanic Cloud cluster NGC1978, recently confirmed to harbor multiple populations of nearly the same age. We used accurate Stromgren photometry of carefully selected cluster red giant branch stars along with a high-dispersion spectroscopy-based calibration of the metallicity-sensitive index m1. Once accounting for the photometry quality, assessed from extensive artificial stars tests to trace the photometric uncertainties as a function of the position to the cluster's center as well as the stellar brightness, and those from the me"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.00685","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":"1812.00685","created_at":"2026-05-17T23:55:53.644971+00:00"},{"alias_kind":"arxiv_version","alias_value":"1812.00685v1","created_at":"2026-05-17T23:55:53.644971+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.00685","created_at":"2026-05-17T23:55:53.644971+00:00"},{"alias_kind":"pith_short_12","alias_value":"FPRD52ZKOXOS","created_at":"2026-05-18T12:32:25.280505+00:00"},{"alias_kind":"pith_short_16","alias_value":"FPRD52ZKOXOSD3I3","created_at":"2026-05-18T12:32:25.280505+00:00"},{"alias_kind":"pith_short_8","alias_value":"FPRD52ZK","created_at":"2026-05-18T12:32:25.280505+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/FPRD52ZKOXOSD3I3I6AFNNUMOX","json":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX.json","graph_json":"https://pith.science/api/pith-number/FPRD52ZKOXOSD3I3I6AFNNUMOX/graph.json","events_json":"https://pith.science/api/pith-number/FPRD52ZKOXOSD3I3I6AFNNUMOX/events.json","paper":"https://pith.science/paper/FPRD52ZK"},"agent_actions":{"view_html":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX","download_json":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX.json","view_paper":"https://pith.science/paper/FPRD52ZK","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1812.00685&json=true","fetch_graph":"https://pith.science/api/pith-number/FPRD52ZKOXOSD3I3I6AFNNUMOX/graph.json","fetch_events":"https://pith.science/api/pith-number/FPRD52ZKOXOSD3I3I6AFNNUMOX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX/action/storage_attestation","attest_author":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX/action/author_attestation","sign_citation":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX/action/citation_signature","submit_replication":"https://pith.science/pith/FPRD52ZKOXOSD3I3I6AFNNUMOX/action/replication_record"}},"created_at":"2026-05-17T23:55:53.644971+00:00","updated_at":"2026-05-17T23:55:53.644971+00:00"}