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arXiv 1503.02748astro-ph.SR
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在双白矮星双星上测试共同包络

Testing common envelopes on double white dwarf binaries

Jose L. A. Nandez, Natalia Ivanova, James C. Lombardi

摘要:

双白矮星双星的形成可能涉及在最近一次洛希瓣溢出质量转移期间红巨星和白矮星(WD)之间的共同包络(CE)事件。我们研究的作用,这种恒星相互作用的流体动力学模拟的重组能量。我们发现,复合能有助于驱逐共同的信封完全,而如果不考虑复合能,一个显着的分数的共同信封仍然绑定。我们应用我们的数值方法来约束WD 1101+364的祖先系统-一个双WD二进制,具有良好的测量质量比$q=0.87\pm0.03$和轨道周期为0.145天。我们最适合前共同包膜供体的祖细胞是1.5 $M_\odot$红巨星。

英文摘要:

The formation of a double white dwarf binary likely involves a common envelope (CE) event between a red giant and a white dwarf (WD) during the most recent episode of Roche lobe overflow mass transfer. We study the role of recombination energy with hydrodynamic simulations of such stellar interactions. We find that the recombination energy helps to expel the common envelope entirely, while if recombination energy is not taken into account, a significant fraction of the common envelope remains bound. We apply our numerical methods to constrain the progenitor system for WD 1101+364 -- a double WD binary that has well-measured mass ratio of $q=0.87\pm0.03$ and an orbital period of 0.145 days. Our best-fit progenitor for the pre-common envelope donor is a 1.5 $M_\odot$ red giant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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