Linear spectropolarimetry across the optical spectrum of Herbig Ae/Be stars

Linear spectropolarimetry across the optical spectrum of Herbig Ae/Be stars
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Herbig Ae/Be 星光谱范围内的线性分光偏振测量

DOI:
10.1093/mnras/stw1534
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发表时间:
2016
影响因子:
4.8
通讯作者:
Ababakr K
Ababakr K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ababakr K

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本文给出了12个Herbig Ae/Be天体的分光偏振观测结果。我们的数据具有迄今为止公布的最大的分光偏振波长覆盖范围,4560-9480 nm。在所有物体中检测到穿过H α线的线性偏振的变化。这种线效应揭示了这样一个事实,即恒星光子被自由电子散射,而自由电子并不分布在球对称的体积中,这表明在这些吸积物体周围存在着小圆盘。由于大的波长覆盖范围,我们可以报告说,H α是光学波长范围内的光谱线,对揭示球对称性的偏离最敏感,并且在这种情况下最有可能显示出跨偏振的线效应。很少有其他谱线显示出跨谱线的偏振变化。此外,H α是在某些源中唯一显示出其吸收分量的影响的线。我们提出了一个解释这一发现的方案,并证明了线效应的检测强烈依赖于散射到我们视线中的光子数量。我们强调了R Mon的特殊情况,它是我们样本中唯一一个显示许多具有偏振效应的线的对象,这比所有其他对象都要强得多。鉴于对象和它的星云是空间分辨的,我们认为,这是由于散射的恒星和发射光谱的星周尘埃。
We present the results of spectropolarimetric observations of 12 Herbig Ae/Be objects. Our data have the largest spectropolarimetric wavelength coverage, 4560–9480 Å, published to date. A change in linear polarization across the H α line, is detected in all objects. Such a line effect reveals the fact that stellar photons are scattered off free electrons that are not distributed in a spherically symmetric volume, suggesting the presence of small discs around these accreting objects. Thanks to the large wavelength coverage, we can report that H α is the spectral line in the optical wavelength range that is most sensitive to revealing deviations from spherical symmetry, and the one most likely to show a line effect across the polarization in such cases. Few other spectral lines display changes in polarization across the line. In addition, H α is the only line which shows an effect across its absorption component in some sources. We present a scenario explaining this finding and demonstrate that the detection of the line effect strongly relies on the number of photons scattered into our line of sight. We highlight the special case of R Mon, which is the only object in our sample to show many lines with a polarization effect, which is much stronger than in all other objects. Given that the object and its nebulosity is spatially resolved, we argue that this is due to scattering of the stellar and emission spectrum off circumstellar dust.
B[e] 和 Herbig Be 星的 Hα 分光偏振法
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