Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..557k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 557-579.
Astronomy and Astrophysics
Astronomy
65
A Stars, Magnetic Dipoles, Magnetic Stars, Peculiar Stars, Stellar Oscillations, Amplitude Distribution Analysis, Astronomical Photometry, Harmonic Analysis, High Frequencies, Phase Diagrams
Scientific paper
The authors have reanalysed 135 h of observations of HR 3831 obtained in 1981 together with 43 hr of new observations obtained in 1985 which are presented in this paper. From the relationship between the phase of the principal 1.42801-mHz oscillation and the rotational phase of HR 3831 the authors demonstrate that this principal oscillation is essentially due to a long-lived oblique dipole pulsation mode. They also show that there is a slight, but significant, difference in the oscillation phase diagram between the 1981 and 1985 data sets. The authors compare the rapidly oscillating Ap star models of Dolez & Gough (1982) and Dziembowski & Goode (1985) and find that the model of Dziembowski & Goode, in which the magnetic field rather than the rotation dominates the oscillations, provides the best framework in which to explain both the asymmetry in the periodograms of the light variations and the slight change in those periodograms.
Kurtz Don W.
Shibahashi Hiromoto
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