Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..219t&link_type=abstract
Publications of the Astronomical Society of Japan, v.47, p.219-231.
Astronomy and Astrophysics
Astronomy
43
Asteroseismology, Stars: Magnetic, Stars: Peculiar A, Stars: Pulsation, Stars: Rotation
Scientific paper
We interpret the septuplet fine structure in the power spectrum of a rapidly oscillating Ap star, HR 3831, as a manifestation of the nonradial dipole mode distorted by the magnetic field and the rotation of the star. Taking into account both the dipole and quadrupole components of the magnetic field and using a reasonable theoretical stellar model of an A-type star, we show that the axisymmetric dipole mode in the case of a nonmagnetic nonrotating star is distorted to have l=0, 1, 2, 3, 4, and 5 components, and that the observed septuplet structure can be well explained as a part of the 11-fold fine structure of the induced components. We derive the relations among the amplitudes of the peaks in the fine structure, and show that various parameters of rapidly oscillating Ap stars can be determined by analyzing the fine structure.
Shibahashi Hiromoto
Takata Masao
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