signature=2ea35c89353d4acc79ae1ea30f886c5a,HR 4049: temporal variations in the structure of the circ...

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于 2021-05-29 19:25:13 发布

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文章标签： signature=2ea35c89353d4acc79ae1ea30f886c5a

本文探讨了HR4049星的紫外和光学偏振特性，发现其变化与轨道周期、星际尘埃增色及薄盘散射有关。近紫外偏振源于盘面散射，但垂直于盘面的未知成分引起了额外的偏振。文章深入讨论了这种额外成分可能的来源。

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摘要：

We present ultraviolet (UV) and optical spectropolarimetry of the post-asymptotic giant branch star HR 4049 (= HD 89353). The polarization is time-variable in both magnitude and position angle. The variations in the polarization are tied to the orbital period and the circumstellar reddening and, in the optical, appear to arise from Rayleigh scattering in a thin disc. However, the ultraviolet ( 3000 ) polarization shows the signature of scattering from material in a bipolar distribution. The near-UV ( 20003000 ) polarization has approximately the same position angle as the optical polarization and hence also arises from scattering in a disc. However, the component perpendicular to the disc is of unknown origin. We discuss possible sources for this component.

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