Confirming the Magnetic Field Detection at the Surface of <i>χ</i> Cyg
Abstract We present spectropolarimetric observations of χ Cygni obtained with Neo-Narval at Télescope Bernard Lyot in 2025. We obtained observations across three epochs (2025 July, August, and October) near maximum light to search for magnetic field signatures at the stellar photosphere. We detected a clear circular polarization signal in the 2025 August observations (pulsation phases 0.99–0.01). We measure a mean longitudinal magnetic field of B l = 3.4 ± 0.6 G. No detections were obtained for the 2025 July and October epochs. The pulsation-phase dependence suggests that field detection is tied to specific shock conditions near maximum light.
Authors
- A. López Ariste (ORCID: https://orcid.org/0000-0002-1097-8307)
- P. Mathias (ORCID: https://orcid.org/0000-0001-7748-0178)
- A. Lavail (ORCID: https://orcid.org/0000-0001-8477-5265)
- F. Herpin (ORCID: https://orcid.org/0000-0003-2977-5072)
- A. Lèbre (ORCID: https://orcid.org/0000-0001-9600-8258)
- Quentin Pilate
Institutions
- Centre National de la Recherche Scientifique (FR)
- Université de Bordeaux (FR)
- Université de Montpellier (FR)
- Laboratoire Univers et Particules de Montpellier (FR)
- Laboratoire d'Astrophysique de Bordeaux (FR)
- Institut de Recherche en Astrophysique et Planétologie (FR)
Publication Details
- Journal
- Research Notes of the AAS
- Published
- 2025-12-09
- DOI
- https://doi.org/10.3847/2515-5172/ae290e
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Universität Wien
- Uppsala Universitet