The null result of a search for pulsational variations of the surface magnetic field in the roAp star gamma Equulei
O. Kochukhov, T. Ryabchikova, J. D. Landstreet, W. W. Weiss
Abstract
We describe an analysis of the time-resolved measurements of the surface magnetic field in the roAp star gamma Equ. We have obtained a high-resolution and high S/N spectroscopic time-series, and the magnetic field was determined using Zeeman resolved profiles of the Fe II 6149.25 A and Fe I 6173.34 A lines. Contrary to recent reports we do not find any evidence of magnetic variability with pulsation phase, and derive an upper limit of 5-10 G for pulsational modulation of the surface magnetic field in gamma Equ.
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