{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:3E4EE6VFISZETGC3TJLXPGDD5D","short_pith_number":"pith:3E4EE6VF","schema_version":"1.0","canonical_sha256":"d938427aa544b249985b9a57779863e8f0c0223372c0008704f3415f24f60e25","source":{"kind":"arxiv","id":"0903.3924","version":1},"attestation_state":"computed","paper":{"title":"The Helium content of Globular Clusters: light element abundance correlations and HB morphology. I. NGC6752","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"G. Piotto, R.G. Gratton, S. Villanova","submitted_at":"2009-03-23T18:34:29Z","abstract_excerpt":"Helium has been proposed as the key element to interpret the observed multiple main sequences (MS), subgiant branches (SGB) and red giant branches (RGB), as well as the complex horizontal branch (HB) morphology in Globular Clusters (GC). However, up to now, He was never directly measured in suitable GC stars (8500<Teff<11500 K) with the purpose of verify this hypothesis. We studied 7 hot blue horizontal branch (BHB) stars (Teff<11500 K) in the GC NGC 6752 with the purpose to measure their Helium content. In addition Fe,Cr,Si,Ti,O,Na, and Ba abundances were measured. We could measure He abundan"},"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":"0903.3924","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-03-23T18:34:29Z","cross_cats_sorted":[],"title_canon_sha256":"188dda06e03cb34c5228fe1cd94870aea1c29c22d998371bb0ed620b3e79c74f","abstract_canon_sha256":"65392842b4266e238999871dbd3590abf1da5c2e2c244b9355f53f06196122bc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:26.475866Z","signature_b64":"4UHXwY0peu32z610csims1+AcdlXmnF6z1637pivnTggAOoV+zpxsOg7IBBNZsSuJOEaUNbu6LYZKe59wiRZAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d938427aa544b249985b9a57779863e8f0c0223372c0008704f3415f24f60e25","last_reissued_at":"2026-05-18T02:14:26.475221Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:26.475221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Helium content of Globular Clusters: light element abundance correlations and HB morphology. I. NGC6752","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"G. Piotto, R.G. Gratton, S. Villanova","submitted_at":"2009-03-23T18:34:29Z","abstract_excerpt":"Helium has been proposed as the key element to interpret the observed multiple main sequences (MS), subgiant branches (SGB) and red giant branches (RGB), as well as the complex horizontal branch (HB) morphology in Globular Clusters (GC). However, up to now, He was never directly measured in suitable GC stars (8500<Teff<11500 K) with the purpose of verify this hypothesis. We studied 7 hot blue horizontal branch (BHB) stars (Teff<11500 K) in the GC NGC 6752 with the purpose to measure their Helium content. In addition Fe,Cr,Si,Ti,O,Na, and Ba abundances were measured. We could measure He abundan"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.3924","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":"0903.3924","created_at":"2026-05-18T02:14:26.475366+00:00"},{"alias_kind":"arxiv_version","alias_value":"0903.3924v1","created_at":"2026-05-18T02:14:26.475366+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.3924","created_at":"2026-05-18T02:14:26.475366+00:00"},{"alias_kind":"pith_short_12","alias_value":"3E4EE6VFISZE","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_16","alias_value":"3E4EE6VFISZETGC3","created_at":"2026-05-18T12:25:58.018023+00:00"},{"alias_kind":"pith_short_8","alias_value":"3E4EE6VF","created_at":"2026-05-18T12:25:58.018023+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/3E4EE6VFISZETGC3TJLXPGDD5D","json":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D.json","graph_json":"https://pith.science/api/pith-number/3E4EE6VFISZETGC3TJLXPGDD5D/graph.json","events_json":"https://pith.science/api/pith-number/3E4EE6VFISZETGC3TJLXPGDD5D/events.json","paper":"https://pith.science/paper/3E4EE6VF"},"agent_actions":{"view_html":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D","download_json":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D.json","view_paper":"https://pith.science/paper/3E4EE6VF","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0903.3924&json=true","fetch_graph":"https://pith.science/api/pith-number/3E4EE6VFISZETGC3TJLXPGDD5D/graph.json","fetch_events":"https://pith.science/api/pith-number/3E4EE6VFISZETGC3TJLXPGDD5D/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D/action/storage_attestation","attest_author":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D/action/author_attestation","sign_citation":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D/action/citation_signature","submit_replication":"https://pith.science/pith/3E4EE6VFISZETGC3TJLXPGDD5D/action/replication_record"}},"created_at":"2026-05-18T02:14:26.475366+00:00","updated_at":"2026-05-18T02:14:26.475366+00:00"}