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Abstrakty
We present here new measurements of the longitudinal magnetic field (Be) in the binary system HD 9996, where the primary companion is an Ap star. Series of 63 Be 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 Pmag=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 Pmag. We identify Pmag 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.
Czasopismo
Rocznik
Tom
Strony
297--311
Opis fizyczny
Bibliogr. 31 poz., rys., tab., wykr.
Twórcy
autor
- Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia
autor
- Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia
autor
- Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
autor
- Special Astrophysical Observatory RAS, Niznyi Arkhyz, Russia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-006d286f-5102-468d-95a7-7652d2bfa090