The complex fossil magnetic field of the δ Scuti star HD 41641
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 2021
- DOI:
- 10.1093/mnras/staa3442
- arXiv:
- arXiv:2011.07898
- Bibcode:
- 2021MNRAS.500.1992T
- Keywords:
-
- stars: chemically peculiar;
- stars: individual: HD 41641;
- stars: magnetic field;
- stars: oscillations;
- stars: variables: Scuti;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 9 pages, 6 figures, 5 tables plus 1 in appendix