Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-16
Mon.Not.Roy.Astron.Soc. 330 (2002) 57
Astronomy and Astrophysics
Astrophysics
MNRAS Letters submission
Scientific paper
10.1046/j.1365-8711.2002.05294.x
HR 1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of nonradial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 microHz and 34.6 microHz, with a sixth mode at a problematic spacing of 50.0 microHz (which equals 1.5 times 33.3 microHz) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 microHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha (2001) predicted that there should be a previously undetected mode 34 microHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter, we present preliminary results from a multi-site photometric campaign on the rapidly oscillating Ap star HR 1217 using the "Whole Earth Telescope". While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star, at the frequency predicted by Cunha (2001).
et L. Riddle R. al.
Kawaler Stephen D.
Kurtz Don W.
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