Confirmation of ξ 1 CMa’s ultra-slow rotation: magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines

C. Erba,M. E. Shultz,V. Petit, A. W. Fullerton,H. F. Henrichs,O. Kochukhov,T. Rivinius,G. A. Wade

Monthly Notices of the Royal Astronomical Society（2021）

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摘要

The magnetic β Cep pulsator ξ1 CMa has the longest rotational period of any known magnetic B-type star. It is also the only magnetic B-type star with magnetospheric emission that is known to be modulated by both rotation and pulsation. We report here the first unambiguous detection of a negative longitudinal magnetic field in ξ1 CMa (〈Bz〉 = −87 ± 2 G in 2019 and 〈B...

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关键词

techniques: polarimetric,stars: early-type,stars: individual: ξ1 CMa,stars: magnetic field,stars: massive,ultraviolet: stars

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