Three-dimensional hydrodynamical models of wind and outburst-related accretion in symbiotic systems
Three-dimensional hydrodynamical models of wind and outburst-related accretion in symbiotic systems
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共生系统中风和爆发相关吸积的三维流体动力学模型
DOI：
10.1093/mnras/stx684
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发表时间：
2017
影响因子：
4.8
通讯作者：
J. Stone
中科院分区：
文献类型：
--
作者：
Miguel de Val;M. Karovska;D. Sasselov;J. Stone
由具有气体包层的演化恒星和致密吸积伴星组成的双星系统中的引力聚焦风吸积是解释共生双星中质量传递的可能机制。我们利用全球三维流体动力学数值模拟在静止和爆发阶段研究了由来自初级晚型成分的强风引起的次级周围的质量吸积。特别是，考虑了质量吸积率对质量损失率、风参数和风爆发发展阶段的依赖性。对于来自渐近巨星分支星的典型风，其质量损失率为 1e-6 Msun/年，风速为 20-50 km/s，通过聚焦风的质量传递会导致有效落入次级星。在风速和质量损失率变化的静止期和爆发期，次级粒子的吸积率是初级粒子质量损失的 5-20%，比标准 Bondi-Hoyle-Lyttleton 近似值高出约 20-50%。这种机制可能是解释观测到的吸积光度和各种相互作用的双星系统吸积速率的周期性调制的重要方法。
Gravitationally focused wind accretion in binary systems consisting of an evolved star with a gaseous envelope and a compact accreting companion is a possible mechanism to explain mass transfer in symbiotic binaries. We study the mass accretion around the secondary caused by the strong wind from the primary late-type component using global three-dimensional hydrodynamic numerical simulations during quiescence and outburst stages. In particular, the dependence of the mass accretion rate on the mass-loss rate, wind parameters and phases of wind outburst development is considered. For a typical wind from an asymptotic giant branch star with a mass-loss rate of 1e-6 Msun/year and wind speeds of 20-50 km/s, the mass transfer through a focused wind results in efficient infall on to the secondary. Accretion rates onto the secondary of 5-20 per cent of the mass-loss from the primary are obtained during quiescence and outburst periods where the wind velocity and mass-loss rates are varied, about 20-50 per cent larger than in the standard Bondi-Hoyle-Lyttleton approximation. This mechanism could be an important method for explaining observed accretion luminosities and periodic modulations in the accretion rates for a broad range of interacting binary systems.
红巨星 R Sculptoris 的热脉冲周期中意外的大量质量损失
影响因子：
64.8
作者：
Maercker;Mohamed;Vlemmings;Ramstedt;Groenewegen;Humphreys;Kerschbaum;Lindqvist;Olofsson;Paladini;Wittkowski;de Gregorio-Monsalvo
通讯作者：
de Gregorio-Monsalvo