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The Ap stars that rotate extremely slowly, with periods of decades to centuries, represent one of the keys to the understanding of the processes leading to the differentiation of stellar rotation.\n  Aims. We characterise the variations of the magnetic field of the Ap star HD 50169 and derive constraints about its structure.\n  Methods. We combine published measurements of the mean longitudinal field <Bz> of HD 50169 with new determinations of this field moment from circular spectropolarimetry obtained at the 6-m telescope BTA of the Special Astrophysical Observatory of the Russian Acad"},"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":"1902.05869","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2019-02-15T16:13:19Z","cross_cats_sorted":[],"title_canon_sha256":"cb57666840184909f1b365d83fb146b91261bb5893ad817ef05ddd2b49993e4a","abstract_canon_sha256":"d89faf5ea69a224f0572ac55c79999ad961e569c76ef6323a1b49e845dd6b9c7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:39.010415Z","signature_b64":"rxGDKcnlmKFCrkPDq/DcDPYM1l+15q5azLbJK34ESUcNzS4GBEPgkKE1oTW15MyP488gYDkQb/m4pxF4TD8HAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a2c9cf41f61acfbfab43f68d54577502965378bb1442003f73b216ba2da47516","last_reissued_at":"2026-05-17T23:49:39.009673Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:39.009673Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The variation of the magnetic field of the Ap star HD~50169 over its 29 year rotation period","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"D. 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