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首页> 外文期刊>The Astrophysical journal >Hydrodynamic Models of Line-driven Accretion Disk Winds. III. Local Ionization Equilibrium
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Hydrodynamic Models of Line-driven Accretion Disk Winds. III. Local Ionization Equilibrium

机译:线驱动吸积盘风的流体动力学模型。三,局部电离平衡

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We present time-dependent numerical hydrodynamic models of line-driven accretion disk winds in cataclysmic variable systems and calculate wind mass-loss rates and terminal velocities. The models are 2.5-dimensional, include an energy balance condition with radiative heating and cooling processes, and include local ionization equilibrium introducing time dependence and spatial dependence on the line radiation force parameters. The radiation field is assumed to originate in an optically thick accretion disk. Wind ion populations are calculated under the assumption that local ionization equilibrium is determined by photoionization and radiative recombination, similar to a photoionized nebula. We find a steady wind flowing from the accretion disk. Radiative heating tends to maintain the temperature in the higher density wind regions near the disk surface, rather than cooling adiabatically. For a disk luminosity Ldisk = L☉, white dwarf mass Mwd = 0.6 M☉, and white dwarf radii Rwd = 0.01 R☉, we obtain a wind mass-loss rate of wind = 4 × 10-12 M☉ yr-1 and a terminal velocity of ~3000 km s-1. These results confirm the general velocity and density structures found in our earlier constant ionization equilibrium adiabatic cataclysmic variable wind models. Further, we establish here 2.5-dimensional numerical models that can be extended to QSO/AGN winds where the local ionization equilibrium will play a crucial role in the overall dynamics.
机译:我们提出了在线性变速系统中线性驱动的吸积盘风的时变数值流体动力学模型,并计算了风的质量损失率和终端速度。该模型为2.5维模型,包括具有辐射加热和冷却过程的能量平衡条件,并包括局部电离平衡,引入了对线辐射力参数的时间依赖性和空间依赖性。假设辐射场起源于光学厚度的吸积盘。在假设局部电离平衡是通过光电离和辐射复合来确定的前提下计算风离子的数量,类似于光电离星云。我们从吸积盘中发现稳定的风。辐射加热趋向于在磁盘表面附近的较高密度的风区域保持温度,而不是绝热冷却。对于圆盘光度Ldisk =L☉,白矮星质量Mwd = 0.6M☉,白矮星半径Rwd = 0.01R☉,我们得到风的风量损失率= 4×10-12M☉yr-1和终端速度约为3000 km s-1。这些结果证实了在我们较早的恒定电离平衡绝热催化可变风模型中发现的一般速度和密度结构。此外,我们在此处建立了2.5维数值模型,该模型可以扩展到QSO / AGN风,其中局部电离平衡将在整体动力学中发挥关键作用。

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