| Issue |
A&A
Volume 403, Number 1, May III 2003
|
|
|---|---|---|
| Page(s) | 179 - 185 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20030322 | |
| Published online | 29 April 2003 | |
Structure of the magnetic field in the Ap star HD 187474
1
Main Astronomical Observatory, 27 Zabolotnogo Str., 03680, Kyiv, Ukraine and Isaac Newton Institute of Chile, Kiev Branch
2
Astronomical Institute of the SAS, 05960 Tatranská Lomnica, The Slovak Republic
Corresponding author: V. R. Khalack, khalack@mao.kiev.ua
Received:
29
July
2002
Accepted:
21
February
2003
We reconstruct the complex magnetic field in the Ap star
HD 187474 within the frame of the point field source model,
where virtual magnetic charges are distributed in the stellar body.
The best-fit model describes sufficiently
well the observed nonsinusoidal variability of the mean magnetic field
modulus and the sinusoidal behaviour of the mean longitudinal magnetic
field with the phase of stellar rotation.
The best fit provides discrepancy on the
level of 
for all the analyzed data.
We show that in HD 187474 the magnetic dipole is displaced
from centre of the star by 0.055 
. The dipole
has a size ~0.035 .
The angle between the stellar rotational axis and the magnetic dipole
is 
.
Key words: stars: chemically peculiar / stars: magnetic fields / stars: rotation / stars: individual: HD 187474
© ESO, 2003
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