Abstract
We describe an analysis of the time-resolved measurements of the surface magnetic field in the roAp star y Equ. We have obtained a high-resolution and high signal-to-noise (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 y Equ.
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