The orbital period derivative of PSR 1957+20

P. Mccormick, J. Frank, A. King, A. Rajasekhar
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Abstract

In light of recent observations of PSR 1957+20, we suggest a mechanism in which the mass loss by the secondary carries away varying degrees of specific angular momentum. We present a model which incorporates Roche‐lobe overflow and wind driven mass loss. In our model, Roche‐lobe overflow of the companion produces an evaporating disk or ring. An external disk around the binary may also be created by the mass loss. Changes in the structure of the accretion disk and external disk produce variations in the specific angular momentum carried away by the mass loss. These variations are likely to occur over a viscous timescale. This mechanism could account for the dramatic changes of Pb observed and predicts alternating cycles of expansion and contraction of the binary orbit.
PSR 1957+20的轨道周期导数
根据最近对PSR 1957+20的观测,我们提出了一种机制,即次级星的质量损失带走了不同程度的特定角动量。我们提出了一个包含罗氏叶溢出和风驱动质量损失的模型。在我们的模型中,伴星的罗氏叶溢出产生一个蒸发盘或蒸发环。质量损失也可以在二进制文件周围创建一个外部磁盘。吸积盘和外盘结构的变化使质量损失带走的比角动量发生变化。这些变化很可能发生在一个粘性的时间尺度上。这一机制可以解释观测到的Pb的剧烈变化,并预测双星轨道的膨胀和收缩交替周期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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