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ξ<sup>1</sup>CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star
Abstract We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic β Cep star ξ 1 CMa (B1 III). This high-precision magnetometry is consistent with a rotational period P rot > 40 yr. Absorption line profiles can be reproduced with a non-rotating model. We constrain R ⋆ …