{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:JM3RNTEQRSW6HXMH36NQQLAU42","short_pith_number":"pith:JM3RNTEQ","schema_version":"1.0","canonical_sha256":"4b3716cc908cade3dd87df9b082c14e6a27f0deb97aa0676d77542459faf9266","source":{"kind":"arxiv","id":"0904.1620","version":1},"attestation_state":"computed","paper":{"title":"Chromospheric Variability in Early F-type Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Brian L. Rachford, Dillon R. Foight","submitted_at":"2009-04-09T23:30:30Z","abstract_excerpt":"Using precise measurements of the helium D3 line, we have searched for statistically significant variations in the strength of chromospheric activity in 13 early F-type stars and two late F-type stars. In two early F-type stars, we find short-term (hours to days) variability based on ~25 observations over the course of a week. In an additional two cases we find significant differences between observations taken years apart, but we can most likely explain this apparent long-term variation as an artifact of probable short-term variations. The evidence suggests that pure rotational modulation of "},"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":"0904.1620","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-04-09T23:30:30Z","cross_cats_sorted":[],"title_canon_sha256":"3766cac22efffc4e21124f2a2faf85204cca9206a5dbf3e8098c8e8362b38371","abstract_canon_sha256":"e542d72b7b0c8c86cbbd35d81d21e02c01f161b67834d19c1b918a2bd5a07aca"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:43.621046Z","signature_b64":"oMyYlgaNZs/cBp31zEctYYfsN91W62BtvebVmIXjts9q2Ow/p2au0dtt3JBaP2F1AoWE3EOnmcgWcTcqR+Q+CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4b3716cc908cade3dd87df9b082c14e6a27f0deb97aa0676d77542459faf9266","last_reissued_at":"2026-05-18T04:29:43.620427Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:43.620427Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Chromospheric Variability in Early F-type Stars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Brian L. Rachford, Dillon R. Foight","submitted_at":"2009-04-09T23:30:30Z","abstract_excerpt":"Using precise measurements of the helium D3 line, we have searched for statistically significant variations in the strength of chromospheric activity in 13 early F-type stars and two late F-type stars. In two early F-type stars, we find short-term (hours to days) variability based on ~25 observations over the course of a week. In an additional two cases we find significant differences between observations taken years apart, but we can most likely explain this apparent long-term variation as an artifact of probable short-term variations. The evidence suggests that pure rotational modulation of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.1620","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":"0904.1620","created_at":"2026-05-18T04:29:43.620530+00:00"},{"alias_kind":"arxiv_version","alias_value":"0904.1620v1","created_at":"2026-05-18T04:29:43.620530+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.1620","created_at":"2026-05-18T04:29:43.620530+00:00"},{"alias_kind":"pith_short_12","alias_value":"JM3RNTEQRSW6","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_16","alias_value":"JM3RNTEQRSW6HXMH","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_8","alias_value":"JM3RNTEQ","created_at":"2026-05-18T12:26:00.592388+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/JM3RNTEQRSW6HXMH36NQQLAU42","json":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42.json","graph_json":"https://pith.science/api/pith-number/JM3RNTEQRSW6HXMH36NQQLAU42/graph.json","events_json":"https://pith.science/api/pith-number/JM3RNTEQRSW6HXMH36NQQLAU42/events.json","paper":"https://pith.science/paper/JM3RNTEQ"},"agent_actions":{"view_html":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42","download_json":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42.json","view_paper":"https://pith.science/paper/JM3RNTEQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0904.1620&json=true","fetch_graph":"https://pith.science/api/pith-number/JM3RNTEQRSW6HXMH36NQQLAU42/graph.json","fetch_events":"https://pith.science/api/pith-number/JM3RNTEQRSW6HXMH36NQQLAU42/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42/action/storage_attestation","attest_author":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42/action/author_attestation","sign_citation":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42/action/citation_signature","submit_replication":"https://pith.science/pith/JM3RNTEQRSW6HXMH36NQQLAU42/action/replication_record"}},"created_at":"2026-05-18T04:29:43.620530+00:00","updated_at":"2026-05-18T04:29:43.620530+00:00"}