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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 1986The 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.
Document ID
19900026986
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kurtz, D. W.
(Cape Town Univ. Rondebosch, South Africa)
Martinez, P.
(Cape Town Univ. Rondebosch, South Africa)
Seeman, J.
(Cape Town, University Rondebosch, Republic of South Africa, United States)
Matthews, J. M.
(Western Ontario, University London, Canada)
Cropper, Mark
(Anglo-Australian Observatory Epping, Australia)
Date Acquired
August 14, 2013
Publication Date
October 15, 1989
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 240
ISSN: 0035-8711
Subject Category
Astrophysics
Accession Number
90A14041
Funding Number(s)
PROJECT: FFWF PROJECT 4170
CONTRACT_GRANT: NAGW-778
Distribution Limits
Public
Copyright
Other

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