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1 2005

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Investigation of the Rapid Magnetic Field Variability in γ Equulei

Bychkov V. D., Bychkova L. V., Madej J.

Acta Astronomica

2005

Vol. 55, No. 1

141--149

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 the Special Astrophysical Observatory (Russia) 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 to -750±22 G. Both the power spectrum and the amplitude spectrum of the Be time series are essentially flat. However, they show the presence of a marginally significant magnetic period at PB=3.596 min which is real with the probability of 67%. The amplitude of the magnetic field variations with this period equals 347±31 G. We did not detect variations of Be field in γ Equ with the well-known photometric period, Pphot=12.44 min.