{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:C6ALA3KJL3OGYICX575FGT3GII","short_pith_number":"pith:C6ALA3KJ","schema_version":"1.0","canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","source":{"kind":"arxiv","id":"1008.4478","version":1},"attestation_state":"computed","paper":{"title":"The peculiar Horizontal Branch of NGC 2808","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Lanzoni (1), E. Dalessandro (1), E. Sabbi (6) ((1) Astronomy Department - University of Bologna (2) Astrophysics Research Institute - Liverpool John Moores University (3) INAF - Osservatorio Astronomico di Collurania (4) Astronomy Department - University of Virginia (5) INAF - Osservatorio Astronomico di Bologna (6) Space Telescope Science Institute), F. Fusi Pecci (5), F. R. Ferraro (1), M. Salaris (2), R. T. Rood (4), S. Cassisi (3)","submitted_at":"2010-08-26T11:24:30Z","abstract_excerpt":"We present an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the central region of the cluster obtained with HST. We confirm the multimodal distribution of stars along the HB: 4 sub-populations separated by gaps are distinguishable. The detailed comparison with suitable theoretical models showed that (i) it is not possible to reproduce the luminosity of the entire HB with a single helium abundance, while an appropriate modeling is possible for three HB groups by assuming different"},"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":"1008.4478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-08-26T11:24:30Z","cross_cats_sorted":[],"title_canon_sha256":"ee14d5aaf415b1effcb9d88f2da21d2598e27d586d655d3c27ce313659b53120","abstract_canon_sha256":"8ab2a5cff1233f2b4af476810a9770bc2900c3b69edaf908e8d6d3278024c3f2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:42.526900Z","signature_b64":"xowhNrLsmFVULCav1qP3KLV1NoskYtE7jl4abPlfN66PPVydmi47UtSVGwuzfXFvXsHy6HgAOyvwowIUyq+zCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1780b06d495edc6c2057effa534f664206789f1e9c571633f4f60f0afd79a3f7","last_reissued_at":"2026-05-18T02:05:42.526226Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:42.526226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The peculiar Horizontal Branch of NGC 2808","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"B. Lanzoni (1), E. Dalessandro (1), E. Sabbi (6) ((1) Astronomy Department - University of Bologna (2) Astrophysics Research Institute - Liverpool John Moores University (3) INAF - Osservatorio Astronomico di Collurania (4) Astronomy Department - University of Virginia (5) INAF - Osservatorio Astronomico di Bologna (6) Space Telescope Science Institute), F. Fusi Pecci (5), F. R. Ferraro (1), M. Salaris (2), R. T. Rood (4), S. Cassisi (3)","submitted_at":"2010-08-26T11:24:30Z","abstract_excerpt":"We present an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the central region of the cluster obtained with HST. We confirm the multimodal distribution of stars along the HB: 4 sub-populations separated by gaps are distinguishable. The detailed comparison with suitable theoretical models showed that (i) it is not possible to reproduce the luminosity of the entire HB with a single helium abundance, while an appropriate modeling is possible for three HB groups by assuming different"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4478","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":"1008.4478","created_at":"2026-05-18T02:05:42.526330+00:00"},{"alias_kind":"arxiv_version","alias_value":"1008.4478v1","created_at":"2026-05-18T02:05:42.526330+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4478","created_at":"2026-05-18T02:05:42.526330+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/C6ALA3KJL3OGYICX575FGT3GII","json":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII.json","graph_json":"https://pith.science/api/pith-number/C6ALA3KJL3OGYICX575FGT3GII/graph.json","events_json":"https://pith.science/api/pith-number/C6ALA3KJL3OGYICX575FGT3GII/events.json","paper":"https://pith.science/paper/C6ALA3KJ"},"agent_actions":{"view_html":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII","download_json":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII.json","view_paper":"https://pith.science/paper/C6ALA3KJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1008.4478&json=true","fetch_graph":"https://pith.science/api/pith-number/C6ALA3KJL3OGYICX575FGT3GII/graph.json","fetch_events":"https://pith.science/api/pith-number/C6ALA3KJL3OGYICX575FGT3GII/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/action/timestamp_anchor","attest_storage":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/action/storage_attestation","attest_author":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/action/author_attestation","sign_citation":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/action/citation_signature","submit_replication":"https://pith.science/pith/C6ALA3KJL3OGYICX575FGT3GII/action/replication_record"}},"created_at":"2026-05-18T02:05:42.526330+00:00","updated_at":"2026-05-18T02:05:42.526330+00:00"}