{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:RG2WNKZE6S475AX4LHXY4RXS3O","short_pith_number":"pith:RG2WNKZE","schema_version":"1.0","canonical_sha256":"89b566ab24f4b9fe82fc59ef8e46f2db9f5ce93e784b29ba9cbf96cb7ba60631","source":{"kind":"arxiv","id":"1003.1498","version":1},"attestation_state":"computed","paper":{"title":"Discovery of long-period variable stars in the very-metal-poor globular cluster M15","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Andrea K. Dupree, Iain McDonald, Jacco Th. van Loon, Martha L. Boyer","submitted_at":"2010-03-07T17:31:24Z","abstract_excerpt":"We present a search for long-period variable (LPV) stars among giant branch stars in M15 which, at [Fe/H] ~ -2.3, is one of the most metal-poor Galactic globular clusters. We use multi-colour optical photometry from the 0.6-m Keele Thornton and 2-m Liverpool Telescopes. Variability of delta-V ~ 0.15 mag is detected in K757 and K825 over unusually-long timescales of nearly a year, making them the most metal-poor LPVs found in a Galactic globular cluster. K825 is placed on the long secondary period sequence, identified for metal-rich LPVs, though no primary period is detectable. We discuss this "},"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":"1003.1498","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-03-07T17:31:24Z","cross_cats_sorted":[],"title_canon_sha256":"e43d89f89f1540b91853ab2f1aeb0c53241448271fba3f6eb426c7962d9e091b","abstract_canon_sha256":"f1d7e8e5f7ef748f2d8183f6a1fb813252f090e9b25edab6a67a5c163f4fd124"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:08:45.215698Z","signature_b64":"3dcYnNjTy4ksJYhls3Djn5TWkJjdo9mroeI184QM7JDMmMJPPQGDply5ys4l/kKpCQKIGmlTTDoLDpveffqdCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"89b566ab24f4b9fe82fc59ef8e46f2db9f5ce93e784b29ba9cbf96cb7ba60631","last_reissued_at":"2026-05-18T02:08:45.214964Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:08:45.214964Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of long-period variable stars in the very-metal-poor globular cluster M15","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Andrea K. Dupree, Iain McDonald, Jacco Th. van Loon, Martha L. Boyer","submitted_at":"2010-03-07T17:31:24Z","abstract_excerpt":"We present a search for long-period variable (LPV) stars among giant branch stars in M15 which, at [Fe/H] ~ -2.3, is one of the most metal-poor Galactic globular clusters. We use multi-colour optical photometry from the 0.6-m Keele Thornton and 2-m Liverpool Telescopes. Variability of delta-V ~ 0.15 mag is detected in K757 and K825 over unusually-long timescales of nearly a year, making them the most metal-poor LPVs found in a Galactic globular cluster. K825 is placed on the long secondary period sequence, identified for metal-rich LPVs, though no primary period is detectable. We discuss this "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1003.1498","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1003.1498","created_at":"2026-05-18T02:08:45.215076+00:00"},{"alias_kind":"arxiv_version","alias_value":"1003.1498v1","created_at":"2026-05-18T02:08:45.215076+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1003.1498","created_at":"2026-05-18T02:08:45.215076+00:00"},{"alias_kind":"pith_short_12","alias_value":"RG2WNKZE6S47","created_at":"2026-05-18T12:26:13.927090+00:00"},{"alias_kind":"pith_short_16","alias_value":"RG2WNKZE6S475AX4","created_at":"2026-05-18T12:26:13.927090+00:00"},{"alias_kind":"pith_short_8","alias_value":"RG2WNKZE","created_at":"2026-05-18T12:26:13.927090+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/RG2WNKZE6S475AX4LHXY4RXS3O","json":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O.json","graph_json":"https://pith.science/api/pith-number/RG2WNKZE6S475AX4LHXY4RXS3O/graph.json","events_json":"https://pith.science/api/pith-number/RG2WNKZE6S475AX4LHXY4RXS3O/events.json","paper":"https://pith.science/paper/RG2WNKZE"},"agent_actions":{"view_html":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O","download_json":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O.json","view_paper":"https://pith.science/paper/RG2WNKZE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1003.1498&json=true","fetch_graph":"https://pith.science/api/pith-number/RG2WNKZE6S475AX4LHXY4RXS3O/graph.json","fetch_events":"https://pith.science/api/pith-number/RG2WNKZE6S475AX4LHXY4RXS3O/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O/action/storage_attestation","attest_author":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O/action/author_attestation","sign_citation":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O/action/citation_signature","submit_replication":"https://pith.science/pith/RG2WNKZE6S475AX4LHXY4RXS3O/action/replication_record"}},"created_at":"2026-05-18T02:08:45.215076+00:00","updated_at":"2026-05-18T02:08:45.215076+00:00"}