一种新的恒星偏振机制
A New Mechanism for Polarizing Light from Obscured Stars
摘要：
最近对赫比格AeBe恒星系统的分光偏振观测表明，在它们被遮蔽的H-α发射附近，波长和历元具有线性偏振变化。令人惊讶的是，这种偏振与H-α发射峰不一致，但在谱线轮廓的吸收部分附近是可变的。通过一个新的和新颖的模型，我们在这里表明，这是光泵浦的证据-入射辐射的各向异性，导致线性偏振相关的光学深度内的干预氢风或磁盘云。在这些系统中，这种效应可以产生比散射偏振更大的偏振信号。
英文摘要：
Recent spectropolarimetric observations of Herbig AeBe stellar systems show linear polarization variability with wavelength and epoch near their obscured H-alpha emission. Surprisingly, this polarization is not coincident with the H-alpha emission peak but is variable near the absorptive part of the line profile. With a new and novel model we show here that this is evidence of optical pumping - anisotropy of the incident radiation that leads to a linear polarization-dependent optical depth within the intervening hydrogen wind or disk cloud. This effect can yield a larger polarization signal than scattering polarization in these systems.
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