Axisymmetric and mixed poloidal-toroidal magnetic fields for HD 215441 and 53 Cam
Abstract
A method for the construction of magnetic field geometries from the observed periodic magnetic variations in Ap stars based on the oblique rotator model is presented and applied to the stars HD 215441 and 53 Cam. The method involves the fitting of observations of the surface and effective magnetic fields with the expressions for the surface distribution of the magnetic field components for an axisymmetric magnetic field in order to determine the distribution of the toroidal and poloidal field components. The solutions obtained for various values of the angles i and beta for HD 215441 are found to be characterized by a predominant dipole-like surface structure of the poloidal component with values of the polar strength in the range 40 to 50 kGs and differences in magnetic field at the two poles in the range -40 kGs to -5 kGs. Solutions for 53 Cam are all characterized by poloidal components that have a strong quadrupole-like contribution and relatively strong toroidal components, with a smaller range in polar differences.
- Publication:
-
Liege International Astrophysical Colloquia
- Pub Date:
- 1981
- Bibcode:
- 1981LIACo..23..277G
- Keywords:
-
- A Stars;
- Magnetic Field Configurations;
- Magnetic Variations;
- Peculiar Stars;
- Stellar Magnetic Fields;
- Stellar Rotation;
- Magnetic Stars;
- Poloidal Flux;
- Stellar Models;
- Stream Functions (Fluids);
- Toroids;
- Astrophysics