The high-overtone p-mode spectrum of the rapidly oscillating AP star HR 1217 (HD 24712) - Results of a frequency analysis of 324 HR of multi-site photometric observations obtained during a 46-d time-span in 1986

Details The high-overtone p-mode spectrum of the rapidly oscillating AP star HR 1217 (HD 24712) - Results of a frequency analysis of 324 HR of multi-site photometric observations obtained during a 46-d time-span in 1986 The high-overtone p-mode spectrum of the rapidly oscillating AP star HR 1217 (HD 24712) - Results of a frequency analysis of 324 HR of multi-site photometric observations obtained during a 46-d time-span in 1986

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..881k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 15, 1989, p. 881-915. Research supported by N

Astronomy and Astrophysics

Astronomy

77

A Stars, Astronomical Photometry, Frequency Analyzers, Stellar Oscillations, Stellar Spectra, Magnetic Variations, Phase Modulation, Stellar Magnetic Fields

Scientific paper

The present high-speed photometry for the rapidly oscillating Ap star HR 1217 indicates that the 6-min light variations are amplitude-modulated, in phase with the magnetic variations. Amplitude and magnetic maxima coincide, while the mean light minimum occurs at a perhaps significantly different time. It is established that HR 1217 is an oblique rotator with a centered dipole magnetic field, as well as an oblique pulsator whose pulsation and magnetic axes are aligned. There are six principal frequencies of pulsation; the secondary frequencies indicate that the principal ones are amplitude-modulated on a time-scale of months.

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