{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:WIGHBAU24ERRYOEPBYAUEWNMIW","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":"8c22480b82d4c9882259d97a28e76f63b2a8558d7f7146ac6b50ee245bbc4fbb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-03-20T19:19:03Z","title_canon_sha256":"1c0b4f950a411f9efc8da3cf4d8ad411dc8c7596b165717a0e02ec0cf942ea37"},"schema_version":"1.0","source":{"id":"2003.09469","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.09469","created_at":"2026-07-05T01:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"2003.09469v1","created_at":"2026-07-05T01:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.09469","created_at":"2026-07-05T01:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"WIGHBAU24ERR","created_at":"2026-07-05T01:00:41Z"},{"alias_kind":"pith_short_16","alias_value":"WIGHBAU24ERRYOEP","created_at":"2026-07-05T01:00:41Z"},{"alias_kind":"pith_short_8","alias_value":"WIGHBAU2","created_at":"2026-07-05T01:00:41Z"}],"graph_snapshots":[{"event_id":"sha256:088b459cc438a27d7e93f3091c43d349fefc727491b43012460f79c6ed5a5128","target":"graph","created_at":"2026-07-05T01:00:41Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2003.09469/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared spectra (1.5-1.7 $\\mu$m) from the SDSS APOGEE2-N DR14 database. The main motivation for working with B-type stars is their importance in the evolution of young stellar clusters, however we also take advantage of having a numerous sample (316 stars) of B-type star candidates in APOGEE2-N, for which we also have optical (3600-9100 \\angstrom) counterparts from the LAMOST survey. By first obtaining an accurate spectral classification of the sources using the LAMOST DR3 spectra and the canonical s","authors_text":"Alexandre Rom\\'an-L\\'opes, Anibal Garc\\'ia, Carlos G. Rom\\'an-Zu\\~niga, Guy S. Stringfellow, Jes\\'us Hernandez, Jinyoung Serena Kim, Keivan Stassun, Valeria G. Ram\\'irez-Preciado","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-03-20T19:19:03Z","title":"Spectral classification of B stars: The empirical sequence using SDSS-IV/APOGEE near-IR data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.09469","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:fc3f65418f49eefafe57c91bf6521569c9ed88582d81dc8fc2e2e7754cc6f1ba","target":"record","created_at":"2026-07-05T01:00:41Z","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":"8c22480b82d4c9882259d97a28e76f63b2a8558d7f7146ac6b50ee245bbc4fbb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2020-03-20T19:19:03Z","title_canon_sha256":"1c0b4f950a411f9efc8da3cf4d8ad411dc8c7596b165717a0e02ec0cf942ea37"},"schema_version":"1.0","source":{"id":"2003.09469","kind":"arxiv","version":1}},"canonical_sha256":"b20c70829ae1231c388f0e014259ac45b7576a8aa596963bf9d345417e4e5fd6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b20c70829ae1231c388f0e014259ac45b7576a8aa596963bf9d345417e4e5fd6","first_computed_at":"2026-07-05T01:00:41.846594Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:00:41.846594Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WH2frD/GgKgj/LJqzq1kIA48HKRpia3yCswUjpNyoj9tKKQOiGiPOedmeW6lJXjePp1PlkmplethF/LIJuMIDA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:00:41.847005Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.09469","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fc3f65418f49eefafe57c91bf6521569c9ed88582d81dc8fc2e2e7754cc6f1ba","sha256:088b459cc438a27d7e93f3091c43d349fefc727491b43012460f79c6ed5a5128"],"state_sha256":"be24488c07f1299d150f19fd4411eee1049f24313544f51e4f713e02ec0bfc4d"}