{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:XPXTIEKCOESGYYYRSIE53ELVIW","short_pith_number":"pith:XPXTIEKC","schema_version":"1.0","canonical_sha256":"bbef34114271246c63119209dd917545a502c23aaeea1cd5218f4b8cd7447eaa","source":{"kind":"arxiv","id":"2101.08689","version":1},"attestation_state":"computed","paper":{"title":"Evolved Massive Stars at Low-metallicity IV. Using 1.6 $\\mu$m \"H-bump\" to identify red supergiant stars: a case study of NGC 6822","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Alceste Z. Bonanos, Biwei Jiang, Frank Tramper, Grigoris Maravelias, Jian Gao, Man I Lam, Ming Yang, Panagiotis Gavras, Shu Wang, Xiao-Dian Chen, Yi Ren, Zoi T. Spetsieri","submitted_at":"2021-01-21T16:01:01Z","abstract_excerpt":"We present a case study of using a novel method to identify red supergiant (RSG) candidates in NGC 6822, based on their 1.6 $\\mu$m \"H-bump\". We collected 32 bands of photometric data for NGC 6822 ranging from optical to MIR. By using the theoretical spectra from MARCS, we demonstrate that there is a prominent difference around 1.6 $\\mu$m (\"H-bump\") between low-surface-gravity (LSG) and high-surface-gravity (HSG) targets. Taking advantage of this feature, we identify efficient color-color diagrams (CCDs) of rzH and rzK to separate HSG and LSG targets from crossmatching of optical and NIR data. "},"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":"2101.08689","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2021-01-21T16:01:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"bf9c99560bef211ba22680be21c200f026c0379b971b4660bf65af5c06fc03dd","abstract_canon_sha256":"c2163a3e2d565f63b100a94dbc6369f65b78d0fb99cab1c6816c31aaca1b76ba"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:27:39.637342Z","signature_b64":"O3cqERJriUoCQGUDfNBPkVt/ypJ8mb18ypnAAIbM80Wow2cc7dLpaSNimf1rJGgxXElQfGoca5aEBmZND8lSBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbef34114271246c63119209dd917545a502c23aaeea1cd5218f4b8cd7447eaa","last_reissued_at":"2026-07-05T02:27:39.636892Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:27:39.636892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Evolved Massive Stars at Low-metallicity IV. Using 1.6 $\\mu$m \"H-bump\" to identify red supergiant stars: a case study of NGC 6822","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Alceste Z. Bonanos, Biwei Jiang, Frank Tramper, Grigoris Maravelias, Jian Gao, Man I Lam, Ming Yang, Panagiotis Gavras, Shu Wang, Xiao-Dian Chen, Yi Ren, Zoi T. Spetsieri","submitted_at":"2021-01-21T16:01:01Z","abstract_excerpt":"We present a case study of using a novel method to identify red supergiant (RSG) candidates in NGC 6822, based on their 1.6 $\\mu$m \"H-bump\". We collected 32 bands of photometric data for NGC 6822 ranging from optical to MIR. By using the theoretical spectra from MARCS, we demonstrate that there is a prominent difference around 1.6 $\\mu$m (\"H-bump\") between low-surface-gravity (LSG) and high-surface-gravity (HSG) targets. Taking advantage of this feature, we identify efficient color-color diagrams (CCDs) of rzH and rzK to separate HSG and LSG targets from crossmatching of optical and NIR data. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.08689","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/2101.08689/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":"2101.08689","created_at":"2026-07-05T02:27:39.636962+00:00"},{"alias_kind":"arxiv_version","alias_value":"2101.08689v1","created_at":"2026-07-05T02:27:39.636962+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.08689","created_at":"2026-07-05T02:27:39.636962+00:00"},{"alias_kind":"pith_short_12","alias_value":"XPXTIEKCOESG","created_at":"2026-07-05T02:27:39.636962+00:00"},{"alias_kind":"pith_short_16","alias_value":"XPXTIEKCOESGYYYR","created_at":"2026-07-05T02:27:39.636962+00:00"},{"alias_kind":"pith_short_8","alias_value":"XPXTIEKC","created_at":"2026-07-05T02:27:39.636962+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/XPXTIEKCOESGYYYRSIE53ELVIW","json":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW.json","graph_json":"https://pith.science/api/pith-number/XPXTIEKCOESGYYYRSIE53ELVIW/graph.json","events_json":"https://pith.science/api/pith-number/XPXTIEKCOESGYYYRSIE53ELVIW/events.json","paper":"https://pith.science/paper/XPXTIEKC"},"agent_actions":{"view_html":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW","download_json":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW.json","view_paper":"https://pith.science/paper/XPXTIEKC","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2101.08689&json=true","fetch_graph":"https://pith.science/api/pith-number/XPXTIEKCOESGYYYRSIE53ELVIW/graph.json","fetch_events":"https://pith.science/api/pith-number/XPXTIEKCOESGYYYRSIE53ELVIW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW/action/storage_attestation","attest_author":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW/action/author_attestation","sign_citation":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW/action/citation_signature","submit_replication":"https://pith.science/pith/XPXTIEKCOESGYYYRSIE53ELVIW/action/replication_record"}},"created_at":"2026-07-05T02:27:39.636962+00:00","updated_at":"2026-07-05T02:27:39.636962+00:00"}