Full evolution of low-mass white dwarfs with helium and oxygen cores

Full evolution of low-mass white dwarfs with helium and oxygen cores
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具有氦和氧核心的低质量白矮星的全面演化

DOI:
10.1111/j.1365-2966.2007.12400.x
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发表时间:
2007-12
影响因子:
4.8
通讯作者:
--
中科院分区:
物理与天体物理2区
文献类型:
--
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我们研究了具有氦和氧核的低质量白色矮星的完全演化。基于双星演化计算得到的白色矮星构型,我们重新讨论了在毫秒脉冲星的许多白色矮星伴星中观察到的年龄二分法。我们演化出了11个矮星序,其最终质量分别为0.1604,0.1869,0.2026,0.2495,0.3056,0.3333,0.3515,0.3844,0.3986,0.4160和0.4481 M.此外,我们计算了最终质量为0.3515,0.3844,0.3986,0.4160和0.4481 M的氧核的五个序列的演化。假设金属丰度为Z = 0.02。重力沉降,化学和热扩散占期间的白色矮星制度。我们的研究加强了扩散过程是解释低质量氦核白色矮星中观测到的年龄和包络二分法的关键因素的结果,这是我们早些时候根据对祖星二元演化的简化处理得出的结论。我们确定了年龄二分法发生的质量阈值。对于氧白色矮星序列,我们报告的扩散引起的,氢壳闪光的发生,其中,在氦对应的情况下,强烈影响白色矮星冷却的后期阶段。最后,我们提出我们的结果作为一组白色矮星的氦和氧核心的质量半径关系。
We study the full evolution of low-mass white dwarfs with helium and oxygen cores. We revisit the age dichotomy observed in many white dwarf companions to millisecond pulsar on the basis of white dwarf configurations derived from binary evolution computations. We evolve 11 dwarf sequences for helium cores with final masses of 0.1604, 0.1869, 0.2026, 0.2495, 0.3056, 0.3333, 0.3515, 0.3844, 0.3986, 0.4160 and 0.4481 M.. In addition, we compute the evolution of five sequences for oxygen cores with final masses of 0.3515, 0.3844, 0.3986, 0.4160 and 0.4481 M.. A metallicity of Z = 0.02 is assumed. Gravitational settling, chemical and thermal diffusion are accounted for during the white dwarf regime. Our study reinforces the result that diffusion processes are a key ingredient in explaining the observed age and envelope dichotomy in low-mass helium-core white dwarfs, a conclusion we arrived at earlier on the basis of a simplified treatment for the binary evolution of progenitor stars. We determine the mass threshold where the age dichotomy occurs. For the oxygen white dwarf sequences, we report the occurrence of diffusion-induced, hydrogen-shell flashes, which, as in the case of their helium counterparts, strongly influence the late stages of white dwarf cooling. Finally, we present our results as a set of white dwarf mass-radius relations for helium and oxygen cores.
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