HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights
HARPS spectropolarimetry of three sharp-lined Herbig Ae stars: New insights
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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
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hubrig
中科院分区：
文献类型：
--
作者：
Järvinen;Carroll;Hubrig
AimsRecently，已经提出了几个参数，赞成的情况下，在Herbig Ae星的磁场检测率低，可以解释这些领域的弱点和相当大的测量不确定性。光谱偏振研究涉及尖锐的Herbig Ae星似乎是一个很有前途的方法来检测这样的弱磁场。这些研究提供了关于混合效应、局部速度场和化学丰度的清晰光谱解释，并使我们能够识别适合磁场确定的谱线样本。方法三个尖锐线的高分辨率光谱偏振观测（vsini< 15 km s-1）Herbig Ae星HD 101412、HD 104237和HD 190073是近年来用HARPS摄谱仪在偏振模式下获得的。我们利用这些档案观测来研究它们的纵向磁场的行为。为了进行磁场测量，我们使用了多线奇异值分解（SVD）方法Stokes profile reconstruction.ResultsWe进行了高分辨率的光谱偏振分析的Herbig Ae星星HD 101412的第一次。我们发现，不同的线列表产生的斯托克斯Vsignatures的形状和它们的场强的差异。它们可以解释的背景下，对磁场的测量的星周物质和元素丰度的不均匀性的影响。另一方面，由于前三个历元的塞曼特征尺寸较小，而且缺乏近红外观测，因此无法明确估计星周和光球的贡献。在SB 2系统HD 104237的SVD Stokes V谱中，我们探测到第二分量是一颗金牛座T型星星，它有一个相当强的磁场= 129 ± 12 G，而第一分量没有明显的磁场。我们对HD 190073的测量证实了可变磁场的存在，并表明星周环境可能对观测到的偏振特征产生重大影响。
AimsRecently, several arguments have been presented that favour a scenario in which the low detection rate of magnetic fields in Herbig Ae stars can be explained by the weakness of these fields and rather large measurement uncertainties. Spectropolarimetric studies involving sharp-lined Herbig Ae stars appear to be a promising approach for the detection of such weak magnetic fields. These studies offer a clear spectrum interpretation with respect to the effects of blending, local velocity fields, and chemical abundances, and allow us to identify a proper sample of spectral lines appropriate for magnetic field determination.MethodsHigh-resolution spectropolarimetric observations of the three sharp-lined (vsini< 15 km s-1) Herbig Ae stars HD 101412, HD 104237, and HD 190073 have been obtained in recent years with the HARPS spectrograph in polarimetric mode. We used these archival observations to investigate the behaviour of their longitudinal magnetic fields. To carry out the magnetic field measurements, we used the multi-line singular value decomposition (SVD) method for Stokes profile reconstruction.ResultsWe carried out a high-resolution spectropolarimetric analysis of the Herbig Ae star HD 101412 for the first time. We discovered that different line lists yield differences in both the shape of the StokesVsignatures and their field strengths. They could be interpreted in the context of the impact of the circumstellar matter and elemental abundance inhomogeneities on the measurements of the magnetic field. On the other hand, due to the small size of the Zeeman features on the first three epochs and the lack of near-IR observations, circumstellar and photospheric contributions cannot be estimated unambiguously. In the SVD StokesVspectrum of the SB2 system HD 104237, we detect that the secondary component, which is a T Tauri star, possesses a rather strong magnetic field ⟨Bz⟩ = 129 ± 12 G, while no significant field is present in the primary component. Our measurements of HD 190073 confirm the presence of a variable magnetic field and indicate that the circumstellar environment may have a significant impact on the observed polarization features.
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