首页> 外文OA文献 >Evolution towards and beyond accretion-induced collapse of massive white dwarfs and formation of millisecond pulsars
【2h】

Evolution towards and beyond accretion-induced collapse of massive white dwarfs and formation of millisecond pulsars

机译:朝向和超越吸积引起的大量白色崩溃的演变   矮人和毫秒脉冲星的形成

摘要

Millisecond pulsars (MSPs) are generally believed to be old neutron stars(NSs), formed via type Ib/c core-collapse supernovae (SNe), which have beenspun up to high rotation rates via accretion from a companion star in alow-mass X-ray binary (LMXB). In an alternative formation channel, NSs areproduced via the accretion-induced collapse (AIC) of a massive white dwarf (WD)in a close binary. Here we investigate binary evolution leading to AIC andexamine if NSs formed in this way can subsequently be recycled to form MSPsand, if so, how they can observationally be distinguished from pulsars formedvia the standard core-collapse SN channel in terms of their masses, spins,orbital periods and space velocities. Numerical calculations with a detailedstellar evolution code were used for the first time to study the combined pre-and post-AIC evolution of close binaries. We investigated the mass transferonto a massive WD in 240 systems with three different types of non-degeneratedonor stars: main-sequence stars, red giants, and helium stars. When the WD isable to accrete sufficient mass (depending on the mass-transfer rate and theduration of the accretion phase) we assumed it collapses to form a NS and westudied the dynamical effects of this implosion on the binary orbit.Subsequently, we followed the mass-transfer epoch which resumes once the donorstar refills its Roche lobe and calculated the continued LMXB evolution untilthe end. We demonstrate that the final properties of these MSPs are, ingeneral, remarkably similar to those of MSPs formed via the standardcore-collapse SN channel. However, the resultant MSPs created via the AICchannel preferentially form in certain orbital period intervals. Finally, wediscuss the link between AIC and young NSs in globular clusters. Ourcalculations are also applicable to progenitor binaries of SNe Ia under certainconditions. [Abridged]
机译:毫秒脉冲星(MSP)通常被认为是通过Ib / c型核塌陷超新星(SNe)形成的旧中子星(NSs),通过在低质量X中从伴星的积聚使它们旋转至高自转速度-ray二进制(LMXB)。在另一个形成通道中,NSs通过紧密二元体中大块白矮星(WD)的增生诱导塌陷(AIC)产生。在这里,我们研究了导致AIC的二元进化,并检查了以这种方式形成的NS是否可以随后再循环以形成MSP,如果可以,则如何从质量,自旋,轨道周期和空间速度。首次使用具有详细的星状演化代码的数值计算来研究密闭二进制文件在AIC之前和之后的组合演化。我们研究了质量转移到大型WD的240个系统中,该系统具有三种不同类型的非简并星:主序星,红色巨星和氦星。当WD能够积聚足够的质量时(取决于传质速率和积聚阶段的持续时间),我们假设WD坍塌形成了一个NS,并研究了这种内爆对二元轨道的动力学影响。 -捐赠纪元重新补充其罗氏瓣并计算出持续的LMXB进化直至结束时,转移纪元重新开始。我们证明,这些MSP的最终属性通常与通过标准核心崩溃SN通道形成的MSP的属性大致相似。但是,通过AIC通道创建的最终MSP优先以某些轨道周期间隔形成。最后,我们讨论了球状星团中AIC和年轻NS的联系。在某些条件下,我们的计算也适用于SNe Ia的祖二元。 [简略]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号