Thermal timescale mass transfer rates in intermediate-mass X-ray binaries

Thermal timescale mass transfer rates in intermediate-mass X-ray binaries
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中等质量 X 射线双星中的热时标传质率

DOI:
10.1051/0004-6361:20077637
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发表时间:
2007-08
影响因子:
6.5
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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热时间尺度的质量转移通常发生在密近双星中,其中施主星星的质量大于吸积星星的质量。质量传递速率通常是根据施主星星的开尔文-亥姆霍兹时间尺度来估计的。然而,最近的研究表明,这种方法可能高估了吸积白色矮星或中子星星双星系统的真实的质量传递速率。通过计算不同初始施主质量和轨道周期的双星演化序列,系统地研究了中等质量X射线双星的热时标质量传递过程.从计算结果中,我们发现,平均传质速率是低于传统的估计的一个因素的0.44。
Thermal timescale mass transfer generally occurs in close binaries where the donor star is more massive than the accreting star. The mass transfer rates are usually estimated in terms of the Kelvin-Helmholtz timescale of the donor star. However, recent investigations indicate that this method may overestimate the real mass transfer rates in accreting white dwarf or neutron star binary systems. We have systematically investigated the thermal timescale mass transfer processes in intermediate-mass X-ray binaries, by calculating binary evolution sequences with various initial donor masses and orbital periods. From the calculated results we find that on average the mass transfer rates are lower than traditional estimates by a factor of ∼4.
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