Investigation of the rapid magnetic field variability in gamma Equ
Abstract
We investigated magnetic variability of the roAp star gamma Equ (HD 201601) with high time resolution. Measurements of the stellar longitudinal magnetic field Be were performed with the hydrogen line polarimeter and the 6-m optical telescope of Special Astrophysical Observatory on 20/21 August 1989. We obtained a single 3-hour series of 1720 rapid Be measurements for this star with the average time resolution of 6.6 sec. The averaged value of <Be> on this night equals -750 22 G. Both the power spectrum and the amplitude spectrum of the Be time series essentially are flat. However, they show the presence of a marginally significant magnetic period at PB = 3.596 min. which is real with the probability 67 %. The amplitude of the magnetic field variations with this period equals 347 31 G. We did not detect variations of Be field in gamma Equ with the well-known photometric period, Pphot=12.44 min.
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