Variability of the Ap Star HD 9996

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

Abstrakty

EN

We present here new measurements of the longitudinal magnetic field (B_e) in the binary system HD 9996, where the primary companion is an Ap star. Series of 63 B_e observations was obtained in years 1994-2011 with the 1-m optical telescope of the Special Astrophysical Observatory (Russia). New magnetic data allowed us to refine the long-term magnetic period of HD 9996 to P_mag=21.8 years. Compilation of archival photometric data showed the existence of long-term variations of HD 9996 in time scale of 22-23 yr consistent with P_mag. We identify P_mag with the precession period of the primary Ap star and summarize search for a short-term rotational period and the rotational line broadening in this star.

Słowa kluczowe

EN

stars: chemically peculiar; stars: individual: HD 9996; stars: magnetic field

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2012
• Tom: Vol. 62, No. 3
• Strony: 297--311
• Opis fizyczny: Bibliogr. 31 poz., rys., tab., wykr.

Twórcy

autor

Bychkov V. D.

• Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia

autor

Bychkova L. V.

• Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia

autor

Madej J.

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

autor

Shatilov A. V.

• Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia

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