Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-06
Astron.Astrophys. 415 (2004) L13-L16
Astronomy and Astrophysics
Astrophysics
accepted for publication by Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20040001
We present an analysis of 210 high-resolution time-resolved spectropolarimetric observations of the roAp star gamma 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 Pr III, Nd II and Nd III. In contrast, we find absolutely no evidence for the variation of the mean longitudinal magnetic field over the pulsation period in gamma Equ at the level of 110-240 G which was recently reported by Leone & Kurtz (2003). Our investigation of the variability of circularly polarized profiles of 13 Nd III lines demonstrates that, at the 3 sigma confidence level, no magnetic field variation with an amplitude above 40-60 G was present in gamma Equ during our monitoring of this star.
Kochukhov Oleg
Piskunov Nicolai
Ryabchikova Tanya
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