2004A&A...415L..13K

We present an analysis of 210 high-resolution time-resolved spectropolarimetric observations of the roAp star γ Equ obtained over three nights in August and September 2003. Radial velocity variations due to p-mode non-radial pulsations are clearly detected in the lines of rare-earth elements, in particular PrIII, NdII and NdIII. In contrast, we find absolutely no evidence for the variation of the mean longitudinal magnetic field over the pulsation period in γ Equ at the level of 110-240G which was recently reported by Leone & Kurtz 2003A&A...407L..67L). Our investigation of the variability of circularly polarized profiles of 13 NdIII lines demonstrates that, at the 3σ confidence level, no magnetic field variation with an amplitude above ≃40-60G was present in γ Equ during our monitoring of this star.