{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:3G57KXKVBNMK5UKJNA2NPJWMWV","short_pith_number":"pith:3G57KXKV","canonical_record":{"source":{"id":"astro-ph/0301602","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-01-30T09:50:15Z","cross_cats_sorted":[],"title_canon_sha256":"63848004d7211632c275d7f1f41b3887e5aa7b4075897e54373236faff88a1c6","abstract_canon_sha256":"9523e2d7a9a7b8ba08914bd0fb36575c9de4893fbc6a677200f5f940604bb036"},"schema_version":"1.0"},"canonical_sha256":"d9bbf55d550b58aed1496834d7a6ccb5627db9632dcc12cd7f4f8e52ed0a9238","source":{"kind":"arxiv","id":"astro-ph/0301602","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0301602","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0301602v1","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0301602","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"3G57KXKVBNMK","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"3G57KXKVBNMK5UKJ","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"3G57KXKV","created_at":"2026-05-18T12:25:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:3G57KXKVBNMK5UKJNA2NPJWMWV","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0301602","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-01-30T09:50:15Z","cross_cats_sorted":[],"title_canon_sha256":"63848004d7211632c275d7f1f41b3887e5aa7b4075897e54373236faff88a1c6","abstract_canon_sha256":"9523e2d7a9a7b8ba08914bd0fb36575c9de4893fbc6a677200f5f940604bb036"},"schema_version":"1.0"},"canonical_sha256":"d9bbf55d550b58aed1496834d7a6ccb5627db9632dcc12cd7f4f8e52ed0a9238","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:21:42.036114Z","signature_b64":"6KfUnrbNNnOUI1PJCYXGGjy0j5fislGPwyy3pYBVKArIFfnRSz2KDWA58oDJcu+JwFWVPaVTCw/UElbZ1MrCCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d9bbf55d550b58aed1496834d7a6ccb5627db9632dcc12cd7f4f8e52ed0a9238","last_reissued_at":"2026-05-18T04:21:42.035660Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:21:42.035660Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0301602","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HfJn95Cll4jBjYpKo+uN3Yz3gteBS+sVrTPmcDllscYrv5GMKhxArhDnymkwDh+irMMNmFV5z5SwqG5GQ0mrAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:19:07.219198Z"},"content_sha256":"742f575dbe6f3a021273da7d583b09598745d1912d41442a3a3964569259b4a3","schema_version":"1.0","event_id":"sha256:742f575dbe6f3a021273da7d583b09598745d1912d41442a3a3964569259b4a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:3G57KXKVBNMK5UKJNA2NPJWMWV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral analysis of sdB stars from the Hamburg Quasar Survey","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. Engels, H. Edelmann, H.-J. Hagen, M. Lemke, R. Napiwotzki, S. Dreizler, U. Heber","submitted_at":"2003-01-30T09:50:15Z","abstract_excerpt":"We present the results of a spectral analysis of a large sample of subdwarf B stars selected from follow-up observations of candidates from the Hamburg Quasar Survey. Fundamental parameters (effective temperature, gravity, and helium abundance) were determined by matching synthetic line profiles calculated from model atmospheres to all hydrogen and helium absorption lines present in the observed optical spectra. The derived helium abundances are compared with the atmospheric parameters to search forpossible trends. We discovered a correlation between the helium abundance and the effective temp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0301602","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:21:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gCUJdv4uZL+XSnB4mAqVMg1OqTTkipbbV/N3JDQXYD/soTtKtKMpIVCtC0hdzkhUz+NzOSizw1/aDtKRjJazBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T20:19:07.219879Z"},"content_sha256":"a0173f591f9f63c932efef6ae24373869c41b628ea9d6bdb604b16fa55f0536c","schema_version":"1.0","event_id":"sha256:a0173f591f9f63c932efef6ae24373869c41b628ea9d6bdb604b16fa55f0536c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/bundle.json","state_url":"https://pith.science/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T20:19:07Z","links":{"resolver":"https://pith.science/pith/3G57KXKVBNMK5UKJNA2NPJWMWV","bundle":"https://pith.science/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/bundle.json","state":"https://pith.science/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3G57KXKVBNMK5UKJNA2NPJWMWV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:3G57KXKVBNMK5UKJNA2NPJWMWV","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":"9523e2d7a9a7b8ba08914bd0fb36575c9de4893fbc6a677200f5f940604bb036","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-01-30T09:50:15Z","title_canon_sha256":"63848004d7211632c275d7f1f41b3887e5aa7b4075897e54373236faff88a1c6"},"schema_version":"1.0","source":{"id":"astro-ph/0301602","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0301602","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0301602v1","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0301602","created_at":"2026-05-18T04:21:42Z"},{"alias_kind":"pith_short_12","alias_value":"3G57KXKVBNMK","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_16","alias_value":"3G57KXKVBNMK5UKJ","created_at":"2026-05-18T12:25:51Z"},{"alias_kind":"pith_short_8","alias_value":"3G57KXKV","created_at":"2026-05-18T12:25:51Z"}],"graph_snapshots":[{"event_id":"sha256:a0173f591f9f63c932efef6ae24373869c41b628ea9d6bdb604b16fa55f0536c","target":"graph","created_at":"2026-05-18T04:21:42Z","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":"We present the results of a spectral analysis of a large sample of subdwarf B stars selected from follow-up observations of candidates from the Hamburg Quasar Survey. Fundamental parameters (effective temperature, gravity, and helium abundance) were determined by matching synthetic line profiles calculated from model atmospheres to all hydrogen and helium absorption lines present in the observed optical spectra. The derived helium abundances are compared with the atmospheric parameters to search forpossible trends. We discovered a correlation between the helium abundance and the effective temp","authors_text":"D. Engels, H. Edelmann, H.-J. Hagen, M. Lemke, R. Napiwotzki, S. Dreizler, U. Heber","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-01-30T09:50:15Z","title":"Spectral analysis of sdB stars from the Hamburg Quasar Survey"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0301602","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":"sha256:742f575dbe6f3a021273da7d583b09598745d1912d41442a3a3964569259b4a3","target":"record","created_at":"2026-05-18T04:21:42Z","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":"9523e2d7a9a7b8ba08914bd0fb36575c9de4893fbc6a677200f5f940604bb036","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-01-30T09:50:15Z","title_canon_sha256":"63848004d7211632c275d7f1f41b3887e5aa7b4075897e54373236faff88a1c6"},"schema_version":"1.0","source":{"id":"astro-ph/0301602","kind":"arxiv","version":1}},"canonical_sha256":"d9bbf55d550b58aed1496834d7a6ccb5627db9632dcc12cd7f4f8e52ed0a9238","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d9bbf55d550b58aed1496834d7a6ccb5627db9632dcc12cd7f4f8e52ed0a9238","first_computed_at":"2026-05-18T04:21:42.035660Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:42.035660Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6KfUnrbNNnOUI1PJCYXGGjy0j5fislGPwyy3pYBVKArIFfnRSz2KDWA58oDJcu+JwFWVPaVTCw/UElbZ1MrCCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:42.036114Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0301602","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:742f575dbe6f3a021273da7d583b09598745d1912d41442a3a3964569259b4a3","sha256:a0173f591f9f63c932efef6ae24373869c41b628ea9d6bdb604b16fa55f0536c"],"state_sha256":"a3eb75922c02ddc3bf0fdf6504ce66aeac3deec221fadc6225e0611676ce6936"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6uSIvLt9RpabRn5/SH4hmpXP4wjrh+HxTp9sNVMrxrjWAshHcHJgDnbrI3NHMP1SHvAOcDJRRxhQouSrul5rAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T20:19:07.223414Z","bundle_sha256":"8f4a8f6f64c56433089ed7913ebc0b8b4ba529f17875e459b2f1c4a2130b3bde"}}