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Red giant branch (RGB) stars are very bright objects in galaxies and are often used as standard candles. Interferometry is the ideal tool to characterize the dynamics and morphology of their atmospheres. Aims. We aim at precisely characterising the surface dynamics of a sample of RGB stars. Methods. We obtained interferometric observations for three RGB stars with the MIRC instrument mounted at the CHARA interfer- ometer. We looked for asymmetries on the stellar surfaces using limb-darkening models. Results. We measured the apparent diameters of HD197989 (Epsilon Cyg) = 4.61+-0.02 mas"},"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":"1703.02406","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-03-07T14:43:03Z","cross_cats_sorted":[],"title_canon_sha256":"bbda3c26161c505bdc0e5b92da3e8d323dfdd1c0a801d372c598bcfae18b659e","abstract_canon_sha256":"789249b44440eb856eae2dcc7cd2522b9873079d176cf60e38c80ed3992733d2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:48:14.242387Z","signature_b64":"EE2/fmqyc9iTbxb+6I3HeHJfubDy6Komrmh+tyRjtLlNzH7YBPqobLOl91z2m7lF/KurhLK+YYJGvEDq5KzBAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"94d743cdca3f4a7d59dcc75d7c1544d6cd3c8d483fe418bd28f318d0f026a048","last_reissued_at":"2026-05-18T00:48:14.241730Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:48:14.241730Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Asymmetries on red giant branch surfaces from CHARA/MIRC optical interferometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Chiavassa, D. Mourard, F. Baron, G. H. Schaefer, G. Perrin, J. D. Monnier, L. Bigot, L. Fossati, M. Asplund, M. Montarg\\`es, N. Nardetto, P. Kervella, R. Collet, R. Ligi, R. Norris, T. A. ten Brummelaar, Z. Magic","submitted_at":"2017-03-07T14:43:03Z","abstract_excerpt":"Context. Red giant branch (RGB) stars are very bright objects in galaxies and are often used as standard candles. Interferometry is the ideal tool to characterize the dynamics and morphology of their atmospheres. Aims. We aim at precisely characterising the surface dynamics of a sample of RGB stars. Methods. We obtained interferometric observations for three RGB stars with the MIRC instrument mounted at the CHARA interfer- ometer. We looked for asymmetries on the stellar surfaces using limb-darkening models. Results. 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