{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1998:OVHLPGLQOYLNDFAAOVV7GVRKME","short_pith_number":"pith:OVHLPGLQ","schema_version":"1.0","canonical_sha256":"754eb799707616d19400756bf3562a612cf6b7fe24cf8e6e2f64a69a820f3397","source":{"kind":"arxiv","id":"astro-ph/9807281","version":1},"attestation_state":"computed","paper":{"title":"Kilohertz Quasi-Periodic Oscillation Peak Separation is not Constant in the Atoll Source 4U 1608-52","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Brian A. Vaughan (Caltech), Eric C. Ford, Jan van Paradijs (University of Amsterdam), Mariano Mendez, Michiel van der Klis, Rudy Wijnands","submitted_at":"1998-07-28T07:45:07Z","abstract_excerpt":"We present new Rossi X-ray Timing Explorer observations of the low-mass X-ray binary 4U 1608-52 during the decay of its 1998 outburst. We detect by a direct FFT method the existence of a second kilohertz quasi-periodic oscillation (kHz QPO) in its power density spectrum, previously only seen by means of the sensitivity-enhancing `shift and add' technique. This result confirms that 4U 1608-52 is a twin kHz QPO source. The frequency separation between these two QPO decreased significantly, from 325.5 +/- 3.4 Hz to 225.3 +/- 12.0 Hz, as the frequency of the lower kHz QPO increased from 470 Hz to "},"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":"astro-ph/9807281","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-07-28T07:45:07Z","cross_cats_sorted":[],"title_canon_sha256":"0811c51fb81fb1156d66d75d66dbd8696a83ae8541fcd97e42a8cf94b307bf67","abstract_canon_sha256":"2ccbcd6ece01642483683ddeb041621a1e31d9b82a1a06c3f40b696a37f3769e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:06:52.906392Z","signature_b64":"RmDd+URPSy3eHfk1FUuZH9A1E2EhMTicKWvJUTpsM40KQu85b1zJ7Tjgy0P6VuetPqu+dDzQzfCPeS0GikqHDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"754eb799707616d19400756bf3562a612cf6b7fe24cf8e6e2f64a69a820f3397","last_reissued_at":"2026-07-04T16:06:52.905683Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:06:52.905683Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Kilohertz Quasi-Periodic Oscillation Peak Separation is not Constant in the Atoll Source 4U 1608-52","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Brian A. Vaughan (Caltech), Eric C. Ford, Jan van Paradijs (University of Amsterdam), Mariano Mendez, Michiel van der Klis, Rudy Wijnands","submitted_at":"1998-07-28T07:45:07Z","abstract_excerpt":"We present new Rossi X-ray Timing Explorer observations of the low-mass X-ray binary 4U 1608-52 during the decay of its 1998 outburst. We detect by a direct FFT method the existence of a second kilohertz quasi-periodic oscillation (kHz QPO) in its power density spectrum, previously only seen by means of the sensitivity-enhancing `shift and add' technique. This result confirms that 4U 1608-52 is a twin kHz QPO source. The frequency separation between these two QPO decreased significantly, from 325.5 +/- 3.4 Hz to 225.3 +/- 12.0 Hz, as the frequency of the lower kHz QPO increased from 470 Hz to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9807281","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/astro-ph/9807281/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":"astro-ph/9807281","created_at":"2026-07-04T16:06:52.905812+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9807281v1","created_at":"2026-07-04T16:06:52.905812+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9807281","created_at":"2026-07-04T16:06:52.905812+00:00"},{"alias_kind":"pith_short_12","alias_value":"OVHLPGLQOYLN","created_at":"2026-07-04T16:06:52.905812+00:00"},{"alias_kind":"pith_short_16","alias_value":"OVHLPGLQOYLNDFAA","created_at":"2026-07-04T16:06:52.905812+00:00"},{"alias_kind":"pith_short_8","alias_value":"OVHLPGLQ","created_at":"2026-07-04T16:06:52.905812+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2504.18403","citing_title":"Generalizing the relativistic precession model of quasi-periodic oscillations through anharmonic corrections","ref_index":87,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME","json":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME.json","graph_json":"https://pith.science/api/pith-number/OVHLPGLQOYLNDFAAOVV7GVRKME/graph.json","events_json":"https://pith.science/api/pith-number/OVHLPGLQOYLNDFAAOVV7GVRKME/events.json","paper":"https://pith.science/paper/OVHLPGLQ"},"agent_actions":{"view_html":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME","download_json":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME.json","view_paper":"https://pith.science/paper/OVHLPGLQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9807281&json=true","fetch_graph":"https://pith.science/api/pith-number/OVHLPGLQOYLNDFAAOVV7GVRKME/graph.json","fetch_events":"https://pith.science/api/pith-number/OVHLPGLQOYLNDFAAOVV7GVRKME/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME/action/storage_attestation","attest_author":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME/action/author_attestation","sign_citation":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME/action/citation_signature","submit_replication":"https://pith.science/pith/OVHLPGLQOYLNDFAAOVV7GVRKME/action/replication_record"}},"created_at":"2026-07-04T16:06:52.905812+00:00","updated_at":"2026-07-04T16:06:52.905812+00:00"}