{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:TPV5JAYKVADSW2XEUYR4YBDZPB","short_pith_number":"pith:TPV5JAYK","canonical_record":{"source":{"id":"2202.09185","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-02-18T13:29:53Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"537ae1f67924282abdb2fa39794fdde1beec3a71ae26c2f650fad3f192bb53ee","abstract_canon_sha256":"825c169caf39706191b17aab480a8fd6f7956fc0239516b2a90fdcbbe5a73357"},"schema_version":"1.0"},"canonical_sha256":"9bebd4830aa8072b6ae4a623cc0479784219387cf365f3ee06b4528ca981e7f4","source":{"kind":"arxiv","id":"2202.09185","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.09185","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"arxiv_version","alias_value":"2202.09185v2","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.09185","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_12","alias_value":"TPV5JAYKVADS","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_16","alias_value":"TPV5JAYKVADSW2XE","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_8","alias_value":"TPV5JAYK","created_at":"2026-07-05T04:09:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:TPV5JAYKVADSW2XEUYR4YBDZPB","target":"record","payload":{"canonical_record":{"source":{"id":"2202.09185","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-02-18T13:29:53Z","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"title_canon_sha256":"537ae1f67924282abdb2fa39794fdde1beec3a71ae26c2f650fad3f192bb53ee","abstract_canon_sha256":"825c169caf39706191b17aab480a8fd6f7956fc0239516b2a90fdcbbe5a73357"},"schema_version":"1.0"},"canonical_sha256":"9bebd4830aa8072b6ae4a623cc0479784219387cf365f3ee06b4528ca981e7f4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:09:48.737864Z","signature_b64":"7hfLXi0+7zKI/bFl3oRgUNSwMHCmxZPU+OBLPYYzJN5MvUeoKj+e+lJ15vrG/Q+GuD0OB3/jCrd0KcRdbwbaCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9bebd4830aa8072b6ae4a623cc0479784219387cf365f3ee06b4528ca981e7f4","last_reissued_at":"2026-07-05T04:09:48.737460Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:09:48.737460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2202.09185","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:09:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/y5PPgkinsDbZXHBWIWGHhLRx8XfH9XcihusTTBIAHIBkdwkDepfYk/b3eOEtEv06qYoHxb/NV3vGjUr5LsLBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T21:39:42.384891Z"},"content_sha256":"53873b18809626e3a42d8269a9f9056416c3ed4330f8d2ee57cf6d575b777152","schema_version":"1.0","event_id":"sha256:53873b18809626e3a42d8269a9f9056416c3ed4330f8d2ee57cf6d575b777152"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:TPV5JAYKVADSW2XEUYR4YBDZPB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Identification, mass and age of primary red clump stars from spectral features derived with the LAMOST DR7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"A-Li Luo, Xu-Jiang He, Yu-Qin Chen","submitted_at":"2022-02-18T13:29:53Z","abstract_excerpt":"Although red clump (RC) stars are easy to identify due to their stability of luminosity and color, about 20-50% are actually red giant branch (RGB) stars in the same location on the HR diagram. In this paper, a sample of 210,504 spectra for 184 318 primary RC (PRC) stars from the LAMOST DR7 is identified, which has a purity of higher than 90 percent. The RC and the RGB stars are successfully distinguished through LAMOST spectra(R~1800 and SNR>10) by adopting the XGBoost ensemble learning algorithm, and the secondary RC stars are also removed. The SHapley Additive exPlanations (SHAP) value is u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.09185","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2202.09185/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:09:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CPfljZe4yBBLnGeJSuxyRLzq9Ar7GRs9hX277cT9vCHh5D/HslSp3nvsOJQGotYncjDVapTC/0u4RdqtATP4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T21:39:42.385403Z"},"content_sha256":"fa7447599067da1e3d27ab4079c9d023c44f0ca79a0c2084ca7955ae87fa3bea","schema_version":"1.0","event_id":"sha256:fa7447599067da1e3d27ab4079c9d023c44f0ca79a0c2084ca7955ae87fa3bea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/bundle.json","state_url":"https://pith.science/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/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":"2026-08-05T21:39:42Z","links":{"resolver":"https://pith.science/pith/TPV5JAYKVADSW2XEUYR4YBDZPB","bundle":"https://pith.science/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/bundle.json","state":"https://pith.science/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TPV5JAYKVADSW2XEUYR4YBDZPB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:TPV5JAYKVADSW2XEUYR4YBDZPB","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":"825c169caf39706191b17aab480a8fd6f7956fc0239516b2a90fdcbbe5a73357","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-02-18T13:29:53Z","title_canon_sha256":"537ae1f67924282abdb2fa39794fdde1beec3a71ae26c2f650fad3f192bb53ee"},"schema_version":"1.0","source":{"id":"2202.09185","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2202.09185","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"arxiv_version","alias_value":"2202.09185v2","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2202.09185","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_12","alias_value":"TPV5JAYKVADS","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_16","alias_value":"TPV5JAYKVADSW2XE","created_at":"2026-07-05T04:09:48Z"},{"alias_kind":"pith_short_8","alias_value":"TPV5JAYK","created_at":"2026-07-05T04:09:48Z"}],"graph_snapshots":[{"event_id":"sha256:fa7447599067da1e3d27ab4079c9d023c44f0ca79a0c2084ca7955ae87fa3bea","target":"graph","created_at":"2026-07-05T04:09:48Z","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/2202.09185/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Although red clump (RC) stars are easy to identify due to their stability of luminosity and color, about 20-50% are actually red giant branch (RGB) stars in the same location on the HR diagram. In this paper, a sample of 210,504 spectra for 184 318 primary RC (PRC) stars from the LAMOST DR7 is identified, which has a purity of higher than 90 percent. The RC and the RGB stars are successfully distinguished through LAMOST spectra(R~1800 and SNR>10) by adopting the XGBoost ensemble learning algorithm, and the secondary RC stars are also removed. The SHapley Additive exPlanations (SHAP) value is u","authors_text":"A-Li Luo, Xu-Jiang He, Yu-Qin Chen","cross_cats":["astro-ph.GA","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-02-18T13:29:53Z","title":"Identification, mass and age of primary red clump stars from spectral features derived with the LAMOST DR7"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2202.09185","kind":"arxiv","version":2},"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":"sha256:53873b18809626e3a42d8269a9f9056416c3ed4330f8d2ee57cf6d575b777152","target":"record","created_at":"2026-07-05T04:09:48Z","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":"825c169caf39706191b17aab480a8fd6f7956fc0239516b2a90fdcbbe5a73357","cross_cats_sorted":["astro-ph.GA","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2022-02-18T13:29:53Z","title_canon_sha256":"537ae1f67924282abdb2fa39794fdde1beec3a71ae26c2f650fad3f192bb53ee"},"schema_version":"1.0","source":{"id":"2202.09185","kind":"arxiv","version":2}},"canonical_sha256":"9bebd4830aa8072b6ae4a623cc0479784219387cf365f3ee06b4528ca981e7f4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9bebd4830aa8072b6ae4a623cc0479784219387cf365f3ee06b4528ca981e7f4","first_computed_at":"2026-07-05T04:09:48.737460Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:09:48.737460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7hfLXi0+7zKI/bFl3oRgUNSwMHCmxZPU+OBLPYYzJN5MvUeoKj+e+lJ15vrG/Q+GuD0OB3/jCrd0KcRdbwbaCg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:09:48.737864Z","signed_message":"canonical_sha256_bytes"},"source_id":"2202.09185","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53873b18809626e3a42d8269a9f9056416c3ed4330f8d2ee57cf6d575b777152","sha256:fa7447599067da1e3d27ab4079c9d023c44f0ca79a0c2084ca7955ae87fa3bea"],"state_sha256":"6f1d7aaa7e91f166d65973efcc307ace69b2c8365e4011c8d422f8a18e1f54c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RKJXLdtFnWQXm7MFkdbju28FV4KTwy1C/+Zl0mTKFWYjW+Jw80kd70Q6cCfxrJYNUxFofGWOXpY1lMCvnYqiDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T21:39:42.389314Z","bundle_sha256":"c05cd4f3a08c3381cf3b987eb4d0bd07ec63c4dc0a4334f94019b9f4c53bccd6"}}