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
中科院分区:
文献类型:
--
作者:
Ababakr K
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.
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DOI:
10.1046/j.1365-8711.1999.02383.x
发表时间:
1999
影响因子:
4.8
作者:
R. Oudmaijer;J. Drew
通讯作者:
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影响因子:
4.8
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通讯作者:
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DOI:
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发表时间:
1979
期刊:
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影响因子:
--
作者:
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影响因子:
0.9
作者:
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通讯作者:
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DOI:
10.1088/0004-637x/721/2/1748
发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
作者:
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通讯作者:
P. Voyer