将AGB质量损失包络雕刻成双极行星状星云：V Hydrae中的高速流出
Sculpting an AGB Mass-Loss Envelope into a Bipolar Planetary Nebula: High-Velocity Outflows in V Hydrae
摘要：
我们对碳星V Hya进行了高分辨率的光谱观测，覆盖了4.6微米波段的CO。这些数据，采取了7个纪元，表明V Hya的星周环境包括一个复杂的高速（HV）流出，包含至少6个运动学分量，膨胀速度在70和120 km/s之间，并有约每秒10公里的缓慢正常外流。物理变化发生在HV流出区的时间尺度短至两天，限制其范围< ~ 10^{16} cm。与正常AGB拱星包层（CSE）的典型值（~1 km/s）相比，每个HV分量的固有线宽相当大（6-8 km/s），这是由于HV流出与V Hya CSE的能量相互作用导致的过度湍流和/或大的速度梯度。我们已经模拟了吸收功能设置的温度分布的约束，和质量喷射率的气体在主要的HV组件。
英文摘要：
We have carried out high-resolution spectroscopic observations of the carbon star V Hya, covering the 4.6 micron band of CO. These data, taken over 7 epochs, show that the circumstellar environment of V Hya consists of a complex high-velocity (HV) outflow containing at least six kinematic components with expansion velocities ranging between 70 and 120 km/s, together with a slow-moving normal outflow at about 10 km/s. Physical changes occur in the HV outflow regions on a time-scale as short as two days, limiting their extent to < ~ 10^{16} cm. The intrinsic line-width for each HV component is quite large (6-8 km/s) compared to the typical values (~1 km/s) appropriate for normal AGB circumstellar envelopes (CSEs), due to excess turbulence and/or large velocity gradients resulting from the energetic interaction of the HV outflow with the V Hya CSE. We have modelled the absorption features to set constraints on the temperature distribution in, and the mass ejection-rates for gas in the main HV components.
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