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首页> 外文期刊>Astronomy and astrophysics >B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars β?CMa and ??CMa - Possible lack of a “magnetic desert” in massive stars
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B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars β?CMa and ??CMa - Possible lack of a “magnetic desert” in massive stars

机译：OB恒星（BOB）中的B场：关于检测两个早期B型恒星β？CMa和?? CMa中的弱磁场-在大质量恒星中可能缺少“磁性沙漠”

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摘要

Only a small fraction of massive stars seem to host a measurable structured magnetic field, whose origin is still unknown and whose implications for stellar evolution still need to be assessed. Within the context of the “B fields in OB stars (BOB)” collaboration, we used the HARPSpol spectropolarimeter to observe the early B-type stars β?CMa (HD?44743; B1?II/III) and ??CMa (HD?52089; B1.5II) in December 2013 and April 2014. For both stars, we consistently detected the signature of a weak (<30 G in absolute value) longitudinal magnetic field, approximately constant with time. We determined the physical parameters of both stars and characterise their X-ray spectrum. For the β?Cep star β?CMa, our mode identification analysis led to determining a rotation period of 13.6 ± 1.2 days and of an inclination angle of the rotation axis of 57.6?±?1.7°, with respect to the line of sight. On the basis of these measurements and assuming a dipolar field geometry, we derived a best fitting obliquity of about 22° and a dipolar magnetic field strength (Bd) of about 100 G (60
机译：只有一小部分大质量恒星似乎拥有可测量的结构磁场，其起源仍然未知，并且其对恒星演化的影响仍需评估。在“ OB星中的B场（BOB）”​​合作的背景下，我们使用HARPSpol分光旋光仪观测了早期B型星β？CMa（HD？44743; B1？II / III）和?? CMa（HD对于两颗恒星，我们始终如一地检测到弱的（绝对值<30 G）纵向磁场的信号，该磁场随时间变化大致恒定（？52089; B1.5II）。我们确定了两颗恒星的物理参数，并表征了它们的X射线光谱。对于β？Cep星β？CMa，我们的模式识别分析确定了旋转周期为13.6±1.2天，旋转轴相对于视线的倾斜角为57.6？±？1.7°。在这些测量的基础上，并假设偶极场的几何形状，我们得出以下最佳拟合倾角约为22°，偶极磁场强度（Bd）约为100 G（1σ内60

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