{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:PQHUC64AOY6DSWQQ3IHPKLKXPG","short_pith_number":"pith:PQHUC64A","schema_version":"1.0","canonical_sha256":"7c0f417b80763c395a10da0ef52d5779a519a2b0daafb2db8f76d819aaa379d6","source":{"kind":"arxiv","id":"2109.06390","version":1},"attestation_state":"computed","paper":{"title":"Stellar loci IV. Red giant stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Bingqiu Chen, Haibo Yuan, Maosheng Xiang, Ruoyi Zhang, Xiaowei Liu, Yang Huang","submitted_at":"2021-09-14T01:38:52Z","abstract_excerpt":"In the fourth paper of this series, we present the metallicity-dependent Sloan Digital Sky Survey (SDSS) stellar color loci of red giant stars, using a spectroscopic sample of red giants in the SDSS Stripe 82 region. The stars span a range of 0.55 -- 1.2 mag in color g-i, -0.3 -- -2.5 in metallicity [Fe/H], and have values of surface gravity log g smaller than 3.5 dex. As in the case of main-sequence (MS) stars, the intrinsic widths of loci of red giants are also found to be quite narrow, a few mmag at maximum. There are however systematic differences between the metallicity-dependent stellar "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2109.06390","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-09-14T01:38:52Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"4cc67769ad4fe835132484de1a5271dade20bd493c235c8be86c3acecea17137","abstract_canon_sha256":"08be23a95362a86305853eeb2bd3d092d44771db67fb18e4bba7d5cb8af62a2c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:11:17.525631Z","signature_b64":"Ij7od5c6IdeUWnahYOpW0QIgnmZ3OI2c0CXI97bmfjmIS/XepE5A6poBAz8UsfcZ1/8N4QIuCbYi/ot3+gSqAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c0f417b80763c395a10da0ef52d5779a519a2b0daafb2db8f76d819aaa379d6","last_reissued_at":"2026-07-05T05:11:17.525238Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:11:17.525238Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Stellar loci IV. Red giant stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Bingqiu Chen, Haibo Yuan, Maosheng Xiang, Ruoyi Zhang, Xiaowei Liu, Yang Huang","submitted_at":"2021-09-14T01:38:52Z","abstract_excerpt":"In the fourth paper of this series, we present the metallicity-dependent Sloan Digital Sky Survey (SDSS) stellar color loci of red giant stars, using a spectroscopic sample of red giants in the SDSS Stripe 82 region. The stars span a range of 0.55 -- 1.2 mag in color g-i, -0.3 -- -2.5 in metallicity [Fe/H], and have values of surface gravity log g smaller than 3.5 dex. As in the case of main-sequence (MS) stars, the intrinsic widths of loci of red giants are also found to be quite narrow, a few mmag at maximum. There are however systematic differences between the metallicity-dependent stellar "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.06390","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.06390/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2109.06390","created_at":"2026-07-05T05:11:17.525292+00:00"},{"alias_kind":"arxiv_version","alias_value":"2109.06390v1","created_at":"2026-07-05T05:11:17.525292+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.06390","created_at":"2026-07-05T05:11:17.525292+00:00"},{"alias_kind":"pith_short_12","alias_value":"PQHUC64AOY6D","created_at":"2026-07-05T05:11:17.525292+00:00"},{"alias_kind":"pith_short_16","alias_value":"PQHUC64AOY6DSWQQ","created_at":"2026-07-05T05:11:17.525292+00:00"},{"alias_kind":"pith_short_8","alias_value":"PQHUC64A","created_at":"2026-07-05T05:11:17.525292+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG","json":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG.json","graph_json":"https://pith.science/api/pith-number/PQHUC64AOY6DSWQQ3IHPKLKXPG/graph.json","events_json":"https://pith.science/api/pith-number/PQHUC64AOY6DSWQQ3IHPKLKXPG/events.json","paper":"https://pith.science/paper/PQHUC64A"},"agent_actions":{"view_html":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG","download_json":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG.json","view_paper":"https://pith.science/paper/PQHUC64A","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2109.06390&json=true","fetch_graph":"https://pith.science/api/pith-number/PQHUC64AOY6DSWQQ3IHPKLKXPG/graph.json","fetch_events":"https://pith.science/api/pith-number/PQHUC64AOY6DSWQQ3IHPKLKXPG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG/action/storage_attestation","attest_author":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG/action/author_attestation","sign_citation":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG/action/citation_signature","submit_replication":"https://pith.science/pith/PQHUC64AOY6DSWQQ3IHPKLKXPG/action/replication_record"}},"created_at":"2026-07-05T05:11:17.525292+00:00","updated_at":"2026-07-05T05:11:17.525292+00:00"}