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With fundamental parameters very close to those of the Sun except for a shorter rotation period of 8.8 d, HD 190771 provides us with a first insight into the specific impact of the rotation rate in the dynamo generation of magnetic fields in 1 $M_\\odot$ stars.\n  Methods. We use circularly polarized, high-resolution spectra obtained with the NARVAL spectropolarimeter (Observatoire du Pic du Midi, France) and compute cross-correlation line profiles with high sign"},"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":"0909.2200","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-09-11T15:45:17Z","cross_cats_sorted":[],"title_canon_sha256":"d8dad29710866edbd61f1bc8e5b2a0bb8edce05dd27871d3b8d242693278c438","abstract_canon_sha256":"5be67b30f1bf23cf336b65e9c6adc683f9f13880f1bfd85ba016143f61ca0dbb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:48.853097Z","signature_b64":"Rl+l47oWd1o27O0G5c26bvH+suRavKaX8thFNHBd7Id4uTwpHbxuX4nws7Pf+8pe3h/qgSO8w25LN87EK98vDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d48995841c167dd7d3e150253b6e36d0458a5570527d550219b1a6f1650cc592","last_reissued_at":"2026-05-18T02:11:48.852366Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:48.852366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A polarity reversal in the large-scale magnetic field of the rapidly rotating Sun HD 190771","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. 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