Other
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289..645k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 3, pp. 645-650.
Other
5
Stars: Chemically Peculiar, Stars: Individual: Hd80316, Stars: Oscillations, Stars: Variables: Other
Scientific paper
New high-speed photometric observations of the rapidly oscillating Ap star HD80316 suggest that its principal pulsation mode is an oblique dipole mode with a frequency of either 2251.68 or 2254.47 muHz (P=7.4 min). Rotationally split frequency triplets give two choices for the rotation period, P_rot=2.085+/-0.005 or 4.163+/-0.010d, which agree with possible rotation periods derived independently from mean light observations. Both frequency triplet possibilities show the sum of the rotational inclination, i, and the magnetic obliquity, beta, to be greater than 90 deg. This makes HD80316 only the third roAp star, after HR3831 and HD6532, to have a polarity-reversing dipole pulsation. The two possible rotation periods are so close to multiples of 1 d^-1 that alias problems in our single-site observations preclude a definite solution for the oscillations of this star. Further progress requires multisite observations, or long-term single-site observations to sample all rotation phases.
Hanbury A. G.
Kurtz Don W.
Martinez Peter
Tripe Peter
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