Numerical modeling of circular-polarization profiles for magnetic AP stars
Abstract
A numerical model is developed to relate an Ap star's circular polarization profile to its geometrical parameters at a given phase. The profiles are integrated over the visible surface of the star as Doppler shifted by the rotation of the star to obtain an approximation of the magnetic field structure. When the profiles of a specific spectral line are calculated according to a centered dipole model, the Ap star's rotation and nonuniformity of surface element abundances are found to have a significant effect on the observed field strength. Therefore, intensity profiles must be used with polarization profiles to define the star geometry and magnetic field intensity.
- Publication:
-
Pisma v Astronomicheskii Zhurnal
- Pub Date:
- December 1983
- Bibcode:
- 1983PAZh....9..665P
- Keywords:
-
- A Stars;
- Circular Polarization;
- Magnetic Stars;
- Peculiar Stars;
- Stellar Magnetic Fields;
- Stellar Rotation;
- Magnetic Flux;
- Stellar Models;
- Astrophysics