Investigation of the Rapid Magnetic Field Variability in γ Equulei

• Autorzy: Bychkov V. D. , Bychkova L. V. , Madej J.
• Języki publikacji: EN

Abstrakty

EN

We investigated magnetic variability of the roAp star &gamma Equ (HD 201601) with high time resolution. Measurements of the stellar longitudinal magnetic field B_e 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 B_e measurements for this star with the average time resolution of 6.6 sec. The averaged value of B_e on this night equals to -750±22 G. Both the power spectrum and the amplitude spectrum of the B_e time series are essentially flat. However, they show the presence of a marginally significant magnetic period at P_B=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 B_e field in γ Equ with the well-known photometric period, P_phot=12.44 min.

Słowa kluczowe

EN

stars: magnetic fields; stars: oscillations; stars: chemically peculiar; stars: individual: HD 201601

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2005
• Tom: Vol. 55, No. 1
• Strony: 141--149
• Opis fizyczny: Bibliogr. 27 poz., wykr.

Twórcy

autor

Bychkov V. D.

• Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnij Arkhyz, 369167 Russia

autor

Bychkova L. V.

• Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnij Arkhyz, 369167 Russia

autor

Madej J.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

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