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arXiv 0908.2021astro-ph.SR
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密近双星的质量损失

Mass loss out of close binaries

W. Van Rensbergen, J. P. De Greve, N. Mennekens, K. Jansen, C. De Loore

摘要:

在一个自由的进化场景中,在快速质量转移的时代,质量可以从双星中逃逸。我们计算的质量损失的二进制与B型的主要在出生时,质量转移开始期间的氢核心燃烧的捐助者。我们模拟了这些相互作用双星的质量比和轨道周期的分布。在不同的质量比和轨道周期值下,双星显示大陵五特征的时间已经从保守和自由的进化计算中得到了固定。利用这些数据,我们分别用保守模型和自由模型模拟了藻星的质量比和轨道周期的分布。我们比较的质量比和轨道周期的Algols得到保守的演化与我们的自由模型。由于具有晚期B型主星的双星演化几乎是保守的,所以质量比的总体分布只会比保守计算多产生几个具有高质量比的大陵五。虽然模拟的阿尔戈尔斯轨道周期分布与观测结果吻合得很好,但模拟的质量比分布总是产生太少的大值系统。

英文摘要:

In a liberal evolutionary scenario, mass can escape from a binary during eras of fast mass transfer. We calculate the mass lost by binaries with a B-type primary at birth where mass transfer starts during hydrogen core burning of the donor. We simulate the distribution of mass-ratios and orbital periods for those interacting binaries. The amount of time the binary shows Algol characteristics within different values of mass-ratio and orbital period has been fixed from conservative and liberal evolutionary calculations. We use these data to simulate the distribution of mass-ratios and orbital periods of Algols with the conservative as well as the liberal model. We compare mass-ratios and orbital periods of Algols obtained by conservative evolution with those obtained by our liberal model. Since binaries with a late B-type primary evolve almost conservatively, the overall distribution of mass-ratios will only yield a few Algols more with high mass-ratios than conservative calculations do. Whereas the simulated distribution of orbital periods of Algols fits the observations well, the simulated distribution of mass-ratios produces always too few systems with large values.

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