The complex fossil magnetic field of the $δ$ Scuti star HD\,41641

• Main Authors: Thomson-Paressant, Keegan, Neiner, Coralie, Zwintz, Konstanze, Escorza, Ana
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2020
• Subjects: Solar and Stellar Astrophysics astro-ph.SR; FOS Physical sciences; narval
• Online Access: https://dx.doi.org/10.48550/arxiv.2011.07898; https://arxiv.org/abs/2011.07898

Only three magnetic $δ$ Scuti stars are known as of today. HD 41641 is a $δ$ Scuti star showing chemical peculiarities and rotational modulation of its light-curve, making it a good magnetic candidate. We acquired spectropolarimetric observations of this star with Narval at TBL to search for the presence of a magnetic field and characterize it. We indeed clearly detect a magnetic field in HD 41641, making it the fourth known magnetic $δ$ Scuti star. Our analysis shows that the field is of fossil origin, like magnetic OBA stars, but with a complex field structure rather than the much more usual dipolar structure. : 9 pages, 6 figures, 5 tables plus 1 in appendix