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arXiv 1111.0982astro-ph.SR
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表征第一个Tau Sco类似物的磁场

Characterizing the magnetic fields of the first tau Sco analogues

V. Petit, O. Kochukhov, D. L. Massa, W. L. F. Marcolino, G. A. Wade, R. Ignace

摘要:

B0.2 V磁星Tau Sco由于其高X射线活动,独特的风诊断和复杂的磁场而从大质量OB星中脱颖而出。最近,Petit等人在2011年提出了前两个tau Sco类似物的发现- HD 66665和HD 63425,通过其UV光谱与tau Sco的UV光谱的惊人相似性鉴定。ESPaDOnS和Narval的分光偏振观测是通过大质量恒星的磁性CFHT和TBL大型计划获得的,目的是描述这些恒星的恒星和磁性。在这两颗恒星上都发现了表面强度相似的磁场,加强了磁场的存在与风的特性之间的联系。我们提出了额外的相位分辨的观测,以测量其磁几何形状,并将该几何形状与质量损失的诊断相关联,这些观测是由MiMeS合作为HD 66665提供的。

英文摘要:

The B0.2 V magnetic star tau Sco stands out from the larger population of massive OB stars due to its high X-ray activity, peculiar wind diagnostics and complex magnetic field. Recently, Petit et al. 2011 presented the discovery of the first two tau Sco analogues -- HD 66665 and HD 63425, identified by the striking similarity of their UV spectra to that of tau Sco. ESPaDOnS and Narval spectropolarimetric observations were obtained by the Magnetism in Massive Stars CFHT and TBL Large Programs, in order to characterize the stellar and magnetic properties of these stars. A magnetic field of similar surface strength was found on both stars, reinforcing the connection between the presence of a magnetic field and wind peculiarities. We present additional phase-resolved observations secured by the MiMeS collaboration for HD 66665 in order to measure its magnetic geometry, and correlate that geometry with diagnostics of mass-loss.

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