一个25微米的红色超巨型星云：μ Cep的弧秒尺度质量损失不对称性
A red supergiant nebula at 25 micron: arcsecond scale mass-loss asymmetries of mu Cep
摘要：
我们提供了红超巨星μ Cep的衍射极限（0.6”）24.5微米Subaru/COMICS图像。我们报告检测到一个拱星星云，这是没有发现在较短的波长。它在热红外线中延伸到至少6”的半径。在这些角度尺度上，星云大致是球形的，相反，它在更近的地方显示出明显的不对称形态。我们同时使用球形尘埃辐射转移模型模拟星云的方位角平均强度分布和观测到的光谱能量分布。这些模型表明，在过去的1000年里，质量损失过程是恒定的，质量损失率为10^（-7）Msun/年的几倍。这项工作支持了这样一种观点，即演化的大质量恒星和超新星壳层中的不对称性至少有一部分可能是由于红超巨星阶段的质量损失过程造成的。
英文摘要：
We present diffraction limited (0.6") 24.5micron Subaru/COMICS images of the red supergiant mu Cep. We report the detection of a circumstellar nebula, that was not detected at shorter wavelengths. It extends to a radius of at least 6" in the thermal infrared. On these angular scales, the nebula is roughly spherical, in contrast, it displays a pronounced asymmetric morphology closer in. We simultaneously model the azimuthally averaged intensity profile of the nebula and the observed spectral energy distribution using spherical dust radiative transfer models. The models indicate a constant mass-loss process over the past 1000 years, for mass-loss rates a few times 10^(-7) Msun/yr. This work supports the idea that at least part of the asymmetries in shells of evolved massive stars and supernovae may be due to the mass-loss process in the red supergiant phase.
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