{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:32ZCF23ZSQCTFZQKT74OV6RLWX","short_pith_number":"pith:32ZCF23Z","schema_version":"1.0","canonical_sha256":"deb222eb79940532e60a9ff8eafa2bb5d846664ceb8a1b902c22e08884150fc4","source":{"kind":"arxiv","id":"1012.5652","version":1},"attestation_state":"computed","paper":{"title":"CCD time-series photometry of the globular cluster NGC 6981: Variable star census and physical parameter estimates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Arellano Ferro, D.M. Bramich, R. Figuera Jaimes, Sunetra Giridhar","submitted_at":"2010-12-27T19:55:42Z","abstract_excerpt":"We present the results from 10 nights of observations of the globular cluster NGC 6981 (M72) in the V, R and I Johnson wavebands. We employed the technique of difference image analysis to perform precision differential photometry on the time-series images, which enabled us to carry out a census of the under-studied variable star population of the cluster. We show that 20 suspected variables in the literature are actually non-variable, and we confirm the variable nature of another 29 variables while refining their ephemerides. We also detect 11 new RR Lyrae variables and 3 new SX Phe variables,"},"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":"1012.5652","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-12-27T19:55:42Z","cross_cats_sorted":[],"title_canon_sha256":"d551433f5e9756fa81b10df17bd3abe4d03779bc8260b85a6b3e1c84228a21a1","abstract_canon_sha256":"f5660210496eaed2ee3510af73c6b9d14a22a64784056d7a5c0e78cc0ed5cfb0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:17.430540Z","signature_b64":"hvJBbSTFaeeo/rkgkdiUyVm2WdlQs0KR6H8iiZSOllbFAclDjf/zQIv2fQYb0HlfcNr8B3Q17OXmxlI9VUC0AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"deb222eb79940532e60a9ff8eafa2bb5d846664ceb8a1b902c22e08884150fc4","last_reissued_at":"2026-05-18T02:04:17.429815Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:17.429815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"CCD time-series photometry of the globular cluster NGC 6981: Variable star census and physical parameter estimates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Arellano Ferro, D.M. Bramich, R. Figuera Jaimes, Sunetra Giridhar","submitted_at":"2010-12-27T19:55:42Z","abstract_excerpt":"We present the results from 10 nights of observations of the globular cluster NGC 6981 (M72) in the V, R and I Johnson wavebands. We employed the technique of difference image analysis to perform precision differential photometry on the time-series images, which enabled us to carry out a census of the under-studied variable star population of the cluster. We show that 20 suspected variables in the literature are actually non-variable, and we confirm the variable nature of another 29 variables while refining their ephemerides. We also detect 11 new RR Lyrae variables and 3 new SX Phe variables,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.5652","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":"1012.5652","created_at":"2026-05-18T02:04:17.429919+00:00"},{"alias_kind":"arxiv_version","alias_value":"1012.5652v1","created_at":"2026-05-18T02:04:17.429919+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.5652","created_at":"2026-05-18T02:04:17.429919+00:00"},{"alias_kind":"pith_short_12","alias_value":"32ZCF23ZSQCT","created_at":"2026-05-18T12:26:03.138858+00:00"},{"alias_kind":"pith_short_16","alias_value":"32ZCF23ZSQCTFZQK","created_at":"2026-05-18T12:26:03.138858+00:00"},{"alias_kind":"pith_short_8","alias_value":"32ZCF23Z","created_at":"2026-05-18T12:26:03.138858+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/32ZCF23ZSQCTFZQKT74OV6RLWX","json":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX.json","graph_json":"https://pith.science/api/pith-number/32ZCF23ZSQCTFZQKT74OV6RLWX/graph.json","events_json":"https://pith.science/api/pith-number/32ZCF23ZSQCTFZQKT74OV6RLWX/events.json","paper":"https://pith.science/paper/32ZCF23Z"},"agent_actions":{"view_html":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX","download_json":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX.json","view_paper":"https://pith.science/paper/32ZCF23Z","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1012.5652&json=true","fetch_graph":"https://pith.science/api/pith-number/32ZCF23ZSQCTFZQKT74OV6RLWX/graph.json","fetch_events":"https://pith.science/api/pith-number/32ZCF23ZSQCTFZQKT74OV6RLWX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX/action/storage_attestation","attest_author":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX/action/author_attestation","sign_citation":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX/action/citation_signature","submit_replication":"https://pith.science/pith/32ZCF23ZSQCTFZQKT74OV6RLWX/action/replication_record"}},"created_at":"2026-05-18T02:04:17.429919+00:00","updated_at":"2026-05-18T02:04:17.429919+00:00"}