{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:LGBKU7RQRWZHVTXIBLHOFSJKSQ","short_pith_number":"pith:LGBKU7RQ","canonical_record":{"source":{"id":"1907.00132","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-29T02:29:38Z","cross_cats_sorted":[],"title_canon_sha256":"916af82f263b114550363290acde600d655c1dc601f6635cf099a563d9dbbb67","abstract_canon_sha256":"bb541bb9b4408b1299d6aa0bca0207afc22df0f3eb36d99e15346865c1769816"},"schema_version":"1.0"},"canonical_sha256":"5982aa7e308db27acee80acee2c92a9438160b7ff28bc899d21da5ee03ae93e2","source":{"kind":"arxiv","id":"1907.00132","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.00132","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"arxiv_version","alias_value":"1907.00132v1","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.00132","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"pith_short_12","alias_value":"LGBKU7RQRWZH","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LGBKU7RQRWZHVTXI","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LGBKU7RQ","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:LGBKU7RQRWZHVTXIBLHOFSJKSQ","target":"record","payload":{"canonical_record":{"source":{"id":"1907.00132","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-29T02:29:38Z","cross_cats_sorted":[],"title_canon_sha256":"916af82f263b114550363290acde600d655c1dc601f6635cf099a563d9dbbb67","abstract_canon_sha256":"bb541bb9b4408b1299d6aa0bca0207afc22df0f3eb36d99e15346865c1769816"},"schema_version":"1.0"},"canonical_sha256":"5982aa7e308db27acee80acee2c92a9438160b7ff28bc899d21da5ee03ae93e2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:57.378203Z","signature_b64":"6W0I4gx8LB3tueAd09rSFnmjCe/1iLSR42Hm/XSXijuig8UzBEUvdy3wLT16rNP0Zr365I4oP8al08cEyKipBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5982aa7e308db27acee80acee2c92a9438160b7ff28bc899d21da5ee03ae93e2","last_reissued_at":"2026-05-17T23:41:57.377669Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:57.377669Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.00132","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":"2026-05-17T23:41:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wb/PdF+j7Tkq3e323xWWKdS20MiB2u6fbvrq2nwq6Uz6iWxQms5mMZNqyriWB20O4BVeE6DIFK0yKp20jZutAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:31:27.397531Z"},"content_sha256":"9ef7c1934baf1903a049e63fd6c910d6b2421e6c2663828f43e8842bf44dad83","schema_version":"1.0","event_id":"sha256:9ef7c1934baf1903a049e63fd6c910d6b2421e6c2663828f43e8842bf44dad83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:LGBKU7RQRWZHVTXIBLHOFSJKSQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Searching for Hot Subdwarf Stars in LAMOST DR1-II. Pure spectroscopic identification method for hot subdwarfs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Gang Zhao, Jingkun Zhao, P\\'eter N\\'emeth, Yude Bu, Zhenxin Lei","submitted_at":"2019-06-29T02:29:38Z","abstract_excerpt":"Employing a new machine learning method, named hierarchical extreme learning machine (HELM) algorithm, we identified 56 hot subdwarf stars in the first data release (DR1) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) survey. The atmospheric parameters of the stars are obtained by fitting the profiles of hydrogen (H) Balmer lines and helium (He) lines with synthetic spectra calculated from non-Local Thermodynamic Equilibrium (NLTE) model atmospheres. Five He-rich hot subdwarf stars were found in our sample with their log(nHe/nH) > -1 , while 51 stars are He-poor sdB,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.00132","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":"2026-05-17T23:41:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sfQzHGCkqag0t/lkRMtwiTmeFJABR/KD8EsbMKwo4/UffTZ6/3t9L6IUEI4Ebbb9ShxhKnR34TEMh1MmmsIHBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:31:27.398142Z"},"content_sha256":"608033ec2326221f9e32a6d4fe84b4a5c20d08faaf3278180b756dcf7c98ee90","schema_version":"1.0","event_id":"sha256:608033ec2326221f9e32a6d4fe84b4a5c20d08faaf3278180b756dcf7c98ee90"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/bundle.json","state_url":"https://pith.science/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/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":"2026-05-28T20:31:27Z","links":{"resolver":"https://pith.science/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ","bundle":"https://pith.science/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/bundle.json","state":"https://pith.science/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LGBKU7RQRWZHVTXIBLHOFSJKSQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:LGBKU7RQRWZHVTXIBLHOFSJKSQ","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":"bb541bb9b4408b1299d6aa0bca0207afc22df0f3eb36d99e15346865c1769816","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-29T02:29:38Z","title_canon_sha256":"916af82f263b114550363290acde600d655c1dc601f6635cf099a563d9dbbb67"},"schema_version":"1.0","source":{"id":"1907.00132","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.00132","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"arxiv_version","alias_value":"1907.00132v1","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.00132","created_at":"2026-05-17T23:41:57Z"},{"alias_kind":"pith_short_12","alias_value":"LGBKU7RQRWZH","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LGBKU7RQRWZHVTXI","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LGBKU7RQ","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:608033ec2326221f9e32a6d4fe84b4a5c20d08faaf3278180b756dcf7c98ee90","target":"graph","created_at":"2026-05-17T23:41:57Z","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":"Employing a new machine learning method, named hierarchical extreme learning machine (HELM) algorithm, we identified 56 hot subdwarf stars in the first data release (DR1) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) survey. The atmospheric parameters of the stars are obtained by fitting the profiles of hydrogen (H) Balmer lines and helium (He) lines with synthetic spectra calculated from non-Local Thermodynamic Equilibrium (NLTE) model atmospheres. Five He-rich hot subdwarf stars were found in our sample with their log(nHe/nH) > -1 , while 51 stars are He-poor sdB,","authors_text":"Gang Zhao, Jingkun Zhao, P\\'eter N\\'emeth, Yude Bu, Zhenxin Lei","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-29T02:29:38Z","title":"Searching for Hot Subdwarf Stars in LAMOST DR1-II. Pure spectroscopic identification method for hot subdwarfs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.00132","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":"sha256:9ef7c1934baf1903a049e63fd6c910d6b2421e6c2663828f43e8842bf44dad83","target":"record","created_at":"2026-05-17T23:41:57Z","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":"bb541bb9b4408b1299d6aa0bca0207afc22df0f3eb36d99e15346865c1769816","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-06-29T02:29:38Z","title_canon_sha256":"916af82f263b114550363290acde600d655c1dc601f6635cf099a563d9dbbb67"},"schema_version":"1.0","source":{"id":"1907.00132","kind":"arxiv","version":1}},"canonical_sha256":"5982aa7e308db27acee80acee2c92a9438160b7ff28bc899d21da5ee03ae93e2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5982aa7e308db27acee80acee2c92a9438160b7ff28bc899d21da5ee03ae93e2","first_computed_at":"2026-05-17T23:41:57.377669Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:57.377669Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6W0I4gx8LB3tueAd09rSFnmjCe/1iLSR42Hm/XSXijuig8UzBEUvdy3wLT16rNP0Zr365I4oP8al08cEyKipBg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:57.378203Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.00132","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9ef7c1934baf1903a049e63fd6c910d6b2421e6c2663828f43e8842bf44dad83","sha256:608033ec2326221f9e32a6d4fe84b4a5c20d08faaf3278180b756dcf7c98ee90"],"state_sha256":"1fe33df141a79ee1f2a9d94e2e32db88e91e8fe394306d56ac8e21151d0ce873"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G8crwAL4k3ZQXZRIKnq3avCInDHdL4qZ4hjzoB5t0mIdao9xdzDIwHZNRigpKrgQ/0q4EUuymxZ0d02yMiEBDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T20:31:27.401329Z","bundle_sha256":"cfb586c9857f2b4d3525fbb685cf58e91ade48054d7e0fd1c2d1eb5c486c440d"}}