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Using radial velocity measurements we improve on previous orbital period determinations, or derive periods for the first time. The stars and their periods are\n TT Crt, 0.2683522(5) d;\n EZ Del, 0.2234(5) d;\n LL Lyr, 0.249069(4) d;\n UY Pup, 0.479269(7) d;\n RY Ser, 0.3009(4) d;\n CH UMa, 0.3431843(6) d; and\n SDSS J081321+452809, 0.2890(4) d.\n  For each of the systems we detect the spectrum of the secondary star, estimate its spectral type, "},"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/0401316","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-01-15T20:02:55Z","cross_cats_sorted":[],"title_canon_sha256":"6a8004ca81d4ccd32bfef910c12dd68420b37458ec61597fe1237d8f98f287ad","abstract_canon_sha256":"652f6a85dafad07714afbe2556980fb3cabce00010dc87ea708aac244ea20534"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:33.003603Z","signature_b64":"CECTqxnli/UmGqyzPBYujv7Lijay8YwBdQ9EYgp6EuJcthihE2h+AdpWiWEsCPxGZxzf0me2IxWF3itp2Bu+CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c7442eaae12c9412c0eb05ab6a59f5f271f83d3ddacbbc0b8cc1f1cb22280ed","last_reissued_at":"2026-05-18T01:07:33.002949Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:33.002949Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Spectroscopy of Seven Cataclysmic Variables with Periods Above Five Hours","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) The Lawrenceville School), Cynthia J. Taylor (2) ((1) Dartmouth College, John R. Thorstensen (1), William H. Fenton (1)","submitted_at":"2004-01-15T20:02:55Z","abstract_excerpt":"We present spectroscopy of seven cataclysmic variable stars with orbital periods P(orb) greater than 5 hours, all but one of which are known to be dwarf novae. Using radial velocity measurements we improve on previous orbital period determinations, or derive periods for the first time. The stars and their periods are\n TT Crt, 0.2683522(5) d;\n EZ Del, 0.2234(5) d;\n LL Lyr, 0.249069(4) d;\n UY Pup, 0.479269(7) d;\n RY Ser, 0.3009(4) d;\n CH UMa, 0.3431843(6) d; and\n SDSS J081321+452809, 0.2890(4) d.\n  For each of the systems we detect the spectrum of the secondary star, estimate its spectral type, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0401316","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":"astro-ph/0401316","created_at":"2026-05-18T01:07:33.003042+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0401316v1","created_at":"2026-05-18T01:07:33.003042+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0401316","created_at":"2026-05-18T01:07:33.003042+00:00"},{"alias_kind":"pith_short_12","alias_value":"FR2EF2VOCLEU","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_16","alias_value":"FR2EF2VOCLEUCLAO","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_8","alias_value":"FR2EF2VO","created_at":"2026-05-18T12:25:52.687210+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/FR2EF2VOCLEUCLAOWBNLNJM7L4","json":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4.json","graph_json":"https://pith.science/api/pith-number/FR2EF2VOCLEUCLAOWBNLNJM7L4/graph.json","events_json":"https://pith.science/api/pith-number/FR2EF2VOCLEUCLAOWBNLNJM7L4/events.json","paper":"https://pith.science/paper/FR2EF2VO"},"agent_actions":{"view_html":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4","download_json":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4.json","view_paper":"https://pith.science/paper/FR2EF2VO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0401316&json=true","fetch_graph":"https://pith.science/api/pith-number/FR2EF2VOCLEUCLAOWBNLNJM7L4/graph.json","fetch_events":"https://pith.science/api/pith-number/FR2EF2VOCLEUCLAOWBNLNJM7L4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4/action/storage_attestation","attest_author":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4/action/author_attestation","sign_citation":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4/action/citation_signature","submit_replication":"https://pith.science/pith/FR2EF2VOCLEUCLAOWBNLNJM7L4/action/replication_record"}},"created_at":"2026-05-18T01:07:33.003042+00:00","updated_at":"2026-05-18T01:07:33.003042+00:00"}