...guiding
For HD 83965B, which has a close bright companion, a $18\tt ''$ aperture was used to exclude the companion; continuous guiding on the Channel 2 star was performed to check telescope tracking.
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...ones
There is a caveat: the seismological parallaxes are inferred by applying asymptotic theory. Although roAp stars pulsate in high radial overtones, the frequency spacing for these consecutive overtones is still smaller than the asymptotic one, resulting in (by several percent) systematically smaller seismological parallaxes. Furthermore, model calculations by Gautschy et al. (1998) show that significant deviations of observed frequency spacings from the asymptotic values can occur due to nonadiabatic effects.
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...three
We deliberately do not consider HD 101065 here, since this object is so peculiar that its effective temperature cannot even be estimated with some confidence.
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Copyright The European Southern Observatory (ESO)