Model of the Magnetic Field of HD 187474
Abstract
A model is constructed for the magnetic field of the star HD 187474, which has a very long axial rotation period P = 2345d. It turns out that the structure of the magnetic field is best described by a model of a displaced (Δα = 0.1) dipole inclined to the axis of rotation by an angle β = 24°. The star is inclined to the line of sight by an angle i = 86°. Because of the displaced dipole the magnitude of the magnetic field differs at the poles: Bp = +6300 and 11600 G. A Mercator map of the distribution of the magnetic field over the surface is obtained. The 7 slowly rotating CP stars studied thus far have an average angle β = 62°, which equals the average value for a random orientation of dipoles.
- Publication:
-
Astrophysics
- Pub Date:
- October 2005
- DOI:
- 10.1007/s10511-005-0047-y
- Bibcode:
- 2005Ap.....48..483G
- Keywords:
-
- stars: magnetic fields;
- individual: HD 187474;
- stars: magnetic fields - individual: HD 187474