Models of white dwarfs with high magnetic fields.
Abstract
A novel program for calculating the theoretical spectra and wavelength dependence degrees of the linear and circular polarization for magnetic white dwarfs with hydrogen atmospheres has been developed. Using newer data for the decay times of magnetic fields in white dwarfs, the effect of the Lorentz forces on the hydrostatic structure of the atmosphere is reevaluated, demonstrating that the effect is smaller by a factor of 8 than previously calculated by Landstreet. As an application, new synthetic spectra for the high field object Grw+70 deg 8247 have been calculated, confirming the main results of Wickramasinghe and Ferrario (1988) (a polar field strength Bp = 320 MG).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1992
- Bibcode:
- 1992A&A...265..570J
- Keywords:
-
- Magnetic Stars;
- Stellar Magnetic Fields;
- Stellar Models;
- White Dwarf Stars;
- Absorption Spectra;
- Circular Polarization;
- Linear Polarization;
- Photoionization;
- Radiative Transfer;
- Stellar Atmospheres;
- Astrophysics