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arXiv 1402.0407astro-ph.SRastro-ph.GA
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脉冲星PSR J0337 +1715的内伴星光谱

Spectroscopy of the inner companion of the pulsar PSR J0337+1715

David L. Kaplan, Marten H. van Kerkwijk, Detlev Koester, Ingrid H. Stairs, Scott M. Ransom, Anne M. Archibald, Jason W. T. Hessels, Jason Boyles

摘要:

等级三元系统PSR J 0337 +1715提供了一个前所未有的实验室来研究相互作用系统的长期演化,并探索形成毫秒双星和氦核白矮星的复杂质量转移历史。然而,后者特别需要系统的各个组件的属性的知识。在这里,我们提出了在PSR J 0337 +1715系统的内部同伴的精确光谱。我们确认它是一颗热的低重力DA白矮星,Teff= 15,800 +/-100 K,log(g)=5.82+/-0.05。我们还测量到内部质量比为0.1364+/-0.0015,与脉冲星计时推断的结果完全一致,系统径向速度为29.7+/-0.3 km/s。结合脉冲星计时确定的质量(0.19751 Msun),我们对表面引力的测量意味着半径为0.091+/-0.005 Rsun;进一步结合有效温度和消光,测光意味着距离为1300+/-80 pc。这颗伴星的高温有些令人困惑:根据目前的模型,它可能需要最近一段时间的不稳定氢燃烧,并表明在其演化的这一阶段,物体的寿命令人惊讶地短。我们讨论的背景下,了解PSR J 0337 +1715系统,以及一般的低质量白矮星这些测量的影响。

英文摘要:

The hierarchical triple system PSR J0337+1715 offers an unprecedented laboratory to study secular evolution of interacting systems and to explore the complicated mass-transfer history that forms millisecond pulsars and helium-core white dwarfs. The latter in particular, however, requires knowledge of the properties of the individual components of the system. Here we present precise optical spectroscopy of the inner companion in the PSR J0337+1715 system. We confirm it as a hot, low-gravity DA white dwarf with Teff=15,800+/-100 K and log(g)=5.82+/-0.05. We also measure an inner mass ratio of 0.1364+/-0.0015, entirely consistent with that inferred from pulsar timing, and a systemic radial velocity of 29.7+/-0.3 km/s. Combined with the mass (0.19751 Msun) determined from pulsar timing, our measurement of the surface gravity implies a radius of 0.091+/-0.005 Rsun; combined further with the effective temperature and extinction, the photometry implies a distance of 1300+/-80 pc. The high temperature of the companion is somewhat puzzling: with current models, it likely requires a recent period of unstable hydrogen burning, and suggests a surprisingly short lifetime for objects at this phase in their evolution. We discuss the implications of these measurements in the context of understanding the PSR J0337+1715 system, as well as of low-mass white dwarfs in general.

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