Confirming the Magnetic Field Detection at the Surface of Cyg
Abstract
We present spectropolarimetric observations of Cygni obtained with Neo-Narval at T\'elescope Bernard Lyot in 2025. We obtained observations across three epochs (2025 Jul, Aug, and Oct) near maximum light to search for magnetic field signatures at the stellar photosphere. We detected a clear circular polarization signal in the 2025 Aug observations (pulsation phases 0.99 to 0.01). We measure a mean longitudinal magnetic field of Bl = 3.4 0.6 G. No detections were obtained for the 2025 Jul and Oct epochs. The pulsation-phase dependence suggests that field detection is tied to specific shock conditions near maximum light.
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