{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:SH76R2YVOCPIJF6RDMHDLAIDCG","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":"f92636f567c821e9841ff01a13aa226b7a03319133a31ef82d9c5f88e6fa1859","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T15:15:37Z","title_canon_sha256":"8b7958cc0a49859745b356865b91f41c4cc4dd305f8057f93d8b21a11bdfeec9"},"schema_version":"1.0","source":{"id":"1107.2318","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2318","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2318v1","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2318","created_at":"2026-05-18T02:01:19Z"},{"alias_kind":"pith_short_12","alias_value":"SH76R2YVOCPI","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_16","alias_value":"SH76R2YVOCPIJF6R","created_at":"2026-05-18T12:26:41Z"},{"alias_kind":"pith_short_8","alias_value":"SH76R2YV","created_at":"2026-05-18T12:26:41Z"}],"graph_snapshots":[{"event_id":"sha256:39c0e738e03a379427f6ef9f924cd68ef9d69d472876c0b04e7d3dff1252bf15","target":"graph","created_at":"2026-05-18T02:01:19Z","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":"In recent years new observations of pre-main sequence stars (pre-MS) with Z <= Zsun have been made available. To take full advantage of the continuously growing amount of data of pre-MS stars in different environments, we need to develop updated pre-MS models for a wide range of metallicity to assign reliable ages and masses to the observed stars. We present updated evolutionary pre-MS models and isochrones for a fine grid of mass, age, metallicity, and helium values. We use a standard and well-tested stellar evolutionary code (i.e. FRANEC), that adopts outer boundary conditions from detailed ","authors_text":"E. Tognelli, P. G. Prada Moroni, S. Degl'Innocenti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T15:15:37Z","title":"The Pisa pre-main sequence tracks and isochrones. A database covering a wide range of Z, Y, mass, and age values"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2318","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":"sha256:6a0cc9de57ed0a62e2b06c7f557109b24fe21d14731d64efb5bf2173b94338ec","target":"record","created_at":"2026-05-18T02:01:19Z","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":"f92636f567c821e9841ff01a13aa226b7a03319133a31ef82d9c5f88e6fa1859","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2011-07-12T15:15:37Z","title_canon_sha256":"8b7958cc0a49859745b356865b91f41c4cc4dd305f8057f93d8b21a11bdfeec9"},"schema_version":"1.0","source":{"id":"1107.2318","kind":"arxiv","version":1}},"canonical_sha256":"91ffe8eb15709e8497d11b0e3581031194ed0975b69443a489cec806e42eb525","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"91ffe8eb15709e8497d11b0e3581031194ed0975b69443a489cec806e42eb525","first_computed_at":"2026-05-18T02:01:19.619455Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:19.619455Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dzUNzlQkGHlTtc4FGfu9L3HO1BNxubZxvaiRk7Xm6JIJ07v1F12DBoEYD4RD4s4qKIOwmrkBydtO5Ve1VeKBBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:19.620327Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.2318","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a0cc9de57ed0a62e2b06c7f557109b24fe21d14731d64efb5bf2173b94338ec","sha256:39c0e738e03a379427f6ef9f924cd68ef9d69d472876c0b04e7d3dff1252bf15"],"state_sha256":"3f37f6fb396dc4533a1ff7c1c947a78dd10ef399f3d17d33705fd6bdeaf35ebc"}