Mass Transfer in Binary Stellar Evolution and Its Stability
Mass Transfer in Binary Stellar Evolution and Its Stability
复制标题
双星演化中的质量传递及其稳定性
DOI：
10.4236/ijaa.2015.53026
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. B. Tessema
中科院分区：
文献类型：
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作者：
S. H. Negu;S. B. Tessema
本文研究了二元星星系统的演化及其稳定性条件。我们提出的结果，从调查的质量转移和稳定性的密切的双星星系统使用不同的轨道参数。双星星星演化过程中质量传递的稳定性和不稳定性取决于物质的交换，双星对初始洛希瓣溢出的响应导致施主释放更多的物质。我们的工作主要集中在基本的数学推导，解析解和数值解，以解释在不同的轨道参数的传质系统，以及在这两种情况下与以前的研究结果进行了比较。质量传递通常是稳定的，只要风的比角动量不超过系统的每减少质量的角动量。这适用于动力学和热时间尺度。那些不稳定的系统通常会在热时间尺度上传递质量。在一定的限制性近似下，推导、模拟和讨论了在守恒和非守恒质量转移中，不同轨道参数下，双星系统Roche瓣半径随质量比的变化，以及不同情况下双星系统的演化方程、轨道角动量和相应的解析解和数值解。
The evolution of a binary star system by various analytical and numerical approximations of mass transfer rate normalized to the equilibrium rate and its stability conditions are investigated. We present results from investigations of mass transfer and stability in close binary star systems using the different orbital parameters. The stability and instability of mass transfer in binary star evolution depends on the exchange of material which the response of the binary to the initial Roche lobe overflow causes the donor to loose even more material. Our work is mainly focused on basic mathematical derivations, analytical and numerical solutions in order to explain the mass transfer system in different orbital parameters as well as the results are compared with previous studies in both cases. Mass transfer is usually stable, as long as the winds specific angular momentum does not exceed the angular momentum per reduced mass of the system. This holds for both dynamical and thermal time scales. Those systems which are not stable will usually transfer mass on the thermal time scale. The variation of Roche lobe radius with mass ratio in the binary, for various orbital parameters in the conservative and non-conservative mass transfer, as well as the evolution equations, orbital angular momentum of the binary system and the corresponding analytical and numerical solutions for different cases, under certain restrictive approximations is derived, simulated and discussed.