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Fast rotators on the main sequence, or Ap star descendants, are expected to become magnetic active subgiants during this evolutionary phase. Aims: We compare the surface magnetic fields and activity indicators of two active, fast rotating red giants with similar masses and spectral class but diferent rotation rates - OU And (Prot=24.2 d) and 31 Com (Prot=6.8 d) - to address the question of the origin of their magnetism and high activity.\n  Methods: Observations were carried out with the Narval sp"},"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":"1604.07647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-04-26T12:21:33Z","cross_cats_sorted":[],"title_canon_sha256":"1eae0003ec254d472b2148ade103876431f13aeec07a06e4736b5f08eff4c2ff","abstract_canon_sha256":"d40fa8511f719211a78f629060e3a97f55d1d717fb4e53386da9211ded4f65c1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:12:29.398618Z","signature_b64":"obTrZ00C2rWhQjqPgsL+S2rlXIedKWKtvzDoD+5knjofN/8N4C7l2m3IFAX9HnWNCLG/GfId0B32dlNoK6ltCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a78a05d37c98c435843e426697a72a03411724098dfc69f584d8a19fab88aa26","last_reissued_at":"2026-05-18T01:12:29.398287Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:12:29.398287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The different origins of magnetic fields and activity in the Hertzsprung gap stars, OU Andromedae and 31 Comae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. 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