南方蟹爪的激发与挖掘
Excitation & Excavation of the Claws of the Southern Crab
摘要：
我们表明，南蟹（又名Hen 2 -104）提供了一个吉祥的机会，研究无形的风的形式和速度，挖掘和冲击与密切和高度进化的双星相关的各种类型的双极星云的叶。Hen 2 -104的深三色图像叠加显示，其叶边缘或“爪”的电离状态随着壁纬度的增加而从单电离值稳定地增加到双电离值。这种“反向”电离模式在行星状星云（和类似的天体）中是独一无二的，并且与来自中心源的紫外光电离不相容。我们发现，对电离模式最自洽的解释是由快速（约600 km/s^-1）“锥形”恒星风引起的激波电离，其中恒星风的速度和动量通量随着赤道纬度的增加而增加。我们提出了一个流体动力学模拟，放置在一个统一的上下文中的纬度依赖的形式，多节的墙壁，和反向电离的外叶的Hen 2 -104。
英文摘要：
We show that the Southern Crab (aka Hen2-104) presents an auspicious opportunity to study the form and speed of the invisible winds that excavate and shock the lobes of various types of bipolar nebulae associated with close and highly evolved binary stars. A deep three-color image overlay of Hen2-104 reveals that the ionization state of its lobe edges, or "claws", increases steadily from singly to doubly ionized values with increasing wall latitude. This "reverse" ionization pattern is unique among planetary nebulae (and similar objects) and incompatible with UV photoionization from a central source. We show that the most self-consistent explanation for the ionization pattern is shock ionization by a fast (~600 km s^-1) "tapered" stellar wind in which the speed and momentum flux of the wind increase with equatorial latitude. We present a hydrodynamic simulation that places the latitude-dependent form, the knotty walls, and the reverse ionization of the outer lobes of Hen2-104 into a unified context.
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