The magnetic field in HD 161701, the only binary system identified to consist of an HgMn primary and an Ap secondary
The magnetic field in HD 161701, the only binary system identified to consist of an HgMn primary and an Ap secondary
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HD 161701 中的磁场是唯一被确定由 HgMn 初级和 Ap 次级组成的二元系统
DOI：
10.1093/mnrasl/slu012
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发表时间：
2014
影响因子：
4.8
通讯作者：
M. Giarrusso
中科院分区：
文献类型：
--
作者：
S. Hubrig;T. Carroll;J. F. González;M. Schöller;I. Ilyin;C. Saffe;F. Castelli;F. Leone;M. Giarrusso
最近，我们进行了一个完整的研究SB 2系统HD 161701的轨道周期为12.5 d，由一个HgMn小学和一个经典的Ap中学。由于这是第一个被识别出这种特殊恒星组合的系统，因此研究两个分量中磁场的存在对于研究恒星磁性以及磁场存在对二元系统的影响的天文学家来说非常感兴趣。除了HD 161701之外，目前已知的只有另外一个具有磁性Ap分量的密近双星系统，即HD 98088。使用高精度的径向速度行星地球物理学（HARPS）偏振光谱上获得的连续六个晚上，我们检测到在Ap组件的平均纵向磁场高达200 G的变化在轨道/旋转周期的强度。该组件中的磁场行为与主要组件的位置密切相关，表现出负极性。在初级线圈中未检测到任何上限为1090 G的纵向磁场。
Recently, we performed a complete study of the SB2 system HD 161701 with an orbital period of 12.5 d, consisting of an HgMn primary and a classical Ap secondary. Since this is the first system identified with this particular combination of peculiar stars, a study of the presence of a magnetic field in both components is of considerable interest to astronomers studying stellar magnetism and the impact of the presence of a magnetic field in binary systems. Apart from HD 161701, only one other close binary systems with a magnetic Ap component, the system HD 98088, is currently known. Using high accuracy radial velocity planet searcher (HARPS) polarimetric spectra obtained on six consecutive nights, we detect in the Ap component a mean longitudinal magnetic field of up to 200 G varying in strength over the orbital/rotational period. The magnetic field behaviour in this component is closely related to the position of the primary component, exhibiting negative polarity. There was no detection of any longitudinal magnetic field with an upper limit of ∼90 G in the primary.