The complex fossil magnetic field of the δ Scuti star HD 41641. Issue 2 (5th November 2020)

• Record Type: Journal Article
• Authors: Thomson-Paressant, K; Neiner, C; Zwintz, K; Escorza, A
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 500:Issue 2(2021)
• Page Start: 1992
• Page End: 1999
• Publication Date: 2020-11-05
• Subjects: stars: chemically peculiar -- stars: individual: HD 41641 -- stars: magnetic field -- stars: oscillations -- stars: variables: Scuti; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa3442
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: 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 Télescope Bernard Lyot (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.