Chemical spots on the surface of the strongly magnetic Herbig Ae star HD 101412

Chemical spots on the surface of the strongly magnetic Herbig Ae star HD 101412
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强磁 Herbig Ae 星 HD 101412 表面的化学斑点

DOI:
10.1002/asna.201512353
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发表时间:
2016
影响因子:
0.9
通讯作者:
Schöller
Schöller
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Järvinen;Hubrig;Schöller

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由于对自转周期的了解和相当强的表面磁场的存在,自转周期为42 d的年轻赫比格Ae星星HD 101412成为赫比格Ae恒星中研究最充分的目标之一。HD 101412的高分辨率HARPS偏振光谱最近在七个不同的时期获得。我们的研究所涵盖的HARPS观测的旋转周期的一部分的光谱变化表明,元素Mg,Si,Ca,Ti,Cr,Mn,Fe和Sr的线轮廓是明显的变量,而他表现出的变化,是相反的行为的其他元素的研究。由于经典的Ap星通常表现出的磁场几何形状和元素斑点的分布之间的关系,我们在我们的磁场测量中使用不同的线样本属于三个元素与最多的谱线,钛,铬,铁。在可用频谱所覆盖的时间间隔内,纵向磁场从负极性变为正极性。然而,使用Ti,Cr和Fe线获得的场值分布与先前低分辨率FORS 2测量中确定的磁场值完全不同,其中氢巴耳末线是磁场测量的主要贡献者,表明在磁赤道区域存在所研究的铁峰元素的浓度。此外,我们讨论了周围温暖的星周物质污染在使用Ti线获得的塞曼特征出现中的潜在作用。(© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA,魏因海姆)
Due to the knowledge of the rotation period and the presence of a rather strong surface magnetic field, the sharp‐lined young Herbig Ae star HD 101412 with a rotation period of 42 d has become one of the most well‐studied targets among the Herbig Ae stars. High‐resolution HARPS polarimetric spectra of HD 101412 were recently obtained on seven different epochs. Our study of the spectral variability over the part of the rotation cycle covered by HARPS observations reveals that the line profiles of the elements Mg, Si, Ca, Ti, Cr, Mn, Fe, and Sr are clearly variable while He exhibits variability that is opposite to the behaviour of the other elements studied. Since classical Ap stars usually show a relationship between the magnetic field geometry and the distribution of element spots, we used in our magnetic field measurements different line samples belonging to the three elements with the most numerous spectral lines, Ti, Cr, and Fe. Over the time interval covered by the available spectra, the longitudinal magnetic field changes sign from negative to positive polarity. The distribution of field values obtained using Ti, Cr, and Fe lines is, however, completely different compared to the magnetic field values determined in previous low‐resolution FORS 2 measurements, where hydrogen Balmer lines are the main contributors to the magnetic field measurements, indicating the presence of concentration of the studied iron‐peak elements in the region of the magnetic equator. Further, we discuss the potential role of contamination by the surrounding warm circumstellar matter in the appearance of Zeeman features obtained using Ti lines. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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
发表时间: 2014
影响因子: 4.8
作者:
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Herbig Ae 星 HD 101412 的丰度 - 丰度异常;λ Boo-Vega 特征?
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影响因子: 6.5
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发表时间: 2012
影响因子: 6.5
作者:
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DOI: 10.1051/0004-6361/201117261
发表时间: 2011
影响因子: 6.5
作者:
S. Hubrig;I. Ilyin;M. Briquet;M. Briquet;M. Schöller;J. F. González;N. Nuñez;P. Cat;T. Morel
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三颗锐线赫比格 Ae 星的 HARPS 光谱偏振测量:新见解
DOI: 10.1051/0004-6361/201526903
发表时间: 2015
期刊: arXiv: Solar and Stellar Astrophysics
影响因子: --
作者:
Järvinen;Carroll;Hubrig
通讯作者: Hubrig