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arXiv 1004.4805astro-ph.HE
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孤立中子星到吸积的演化。初始磁场的作用

Evolution of isolated neutron stars till accretion. The role of initial magnetic field

P. A. Boldin, S. B. Popov

摘要:

本文研究了孤立中子星在长时间尺度上的演化,计算了它们在主要演化阶段(喷射器、推进器、吸积器和自转器)的分布。考虑到磁场衰减的可能性,我们比较了不同的初始磁场分布,并在我们的计算中包括亚音速螺旋桨的阶段。结果表明,虽然亚音速螺旋桨阶段可以是相对较长的,最初高度磁化的中子星($B_0\ga 10^{13}$ G)达到吸积制度的银河系的寿命内,如果他们的踢速度不是太大。事实上,在$>$ 10年前进行的先前研究中,未考虑此类对象,导致与早期结论相比,吸积体分数略有增加。大多数类似于壮丽七星的中子星在经过几十亿年的演化后,预计将从星际介质中吸积出来。它们是吸积孤立中子星的主要吸积体。

英文摘要:

We study evolution of isolated neutron stars on long time scale and calculate distribution of these sources in the main evolutionary stages: Ejector, Propeller, Accretor, and Georotator. We compare different initial magnetic field distributions taking into account a possibility of magnetic field decay, and include in our calculations the stage of subsonic Propeller. It is shown that though the subsonic propeller stage can be relatively long, initially highly magnetized neutron stars ($B_0\ga 10^{13}$ G) reach the accretion regime within the Galactic lifetime if their kick velocities are not too large. The fact that in previous studies made $>$10 years ago, such objects were not considered results in a slight increase of the Accretor fraction in comparison with earlier conclusions. Most of the neutron stars similar to the Magnificent seven are expected to become accreting from the interstellar medium after few billion years of their evolution. They are the main predecestors of accreting isolated neutron stars.

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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