Structure of the magnetic field in the Ap star HD 187474

Details Structure of the magnetic field in the Ap star HD 187474 Structure of the magnetic field in the Ap star HD 187474

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..179k&link_type=abstract

Astronomy and Astrophysics, v.403, p.179-185 (2003)

Astronomy and Astrophysics

Astrophysics

9

Stars: Chemically Peculiar, Stars: Magnetic Fields, Stars: Rotation, Stars: Individual: Hd 187474

Scientific paper

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 chi 2=6.10 for all the analyzed data. We show that in HD 187474 the magnetic dipole is displaced from centre of the star by 0.055 Rstar . The dipole has a size ~ 0.035 Rstar . The angle between the stellar rotational axis and the magnetic dipole is beta =37degr .

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