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arXiv 0811.2027astro-ph
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PSR J1753-2240:偏心双星系统中的一颗轻度再循环脉冲星

PSR J1753-2240: A mildly recycled pulsar in an eccentric binary system

M. J. Keith, M. Kramer, A. G. Lyne, R. P. Eatough, I. H. Stairs, A. Possenti, F. Camilo, R. N. Manchester

摘要:

我们报告了在Parkes多波束脉冲星巡天数据库中发现的PSR J1753-2240。这颗95毫秒的脉冲星位于一个轨道周期为13.6天的偏心双星系统中。周期导数测量意味着一个特征年龄超过1 Gyr,这表明脉冲星经历了一段吸积引起的自旋。离心率和自转周期表明伴星是第二颗中子星,因此该系统与PSR J1811-1736类似,但此时不能排除其他伴星类型。伴星的质量受到几何学的限制,必须大于0.48太阳质量,但长期的计时观测会提供额外的限制。如果伴星是一颗白矮星或主序星,光学观测可能会直接探测到伴星。如果这个系统确实是已知的为数不多的双中子星系统之一,那么它与最近提出的自旋-周期/偏心率关系将相距甚远。

英文摘要:

We report the discovery of PSR J1753-2240 in the Parkes Multibeam Pulsar Survey database. This 95-ms pulsar is in an eccentric binary system with a 13.6-day orbital period. Period derivative measurements imply a characteristic age in excess of 1 Gyr, suggesting that the pulsar has undergone an episode of accretion-induced spin-up. The eccentricity and spin period are indicative of the companion being a second neutron star, so that the system is similar to that of PSR J1811-1736, although other companion types cannot be ruled out at this time. The companion mass is constrained by geometry to lie above 0.48 solar masses, although long-term timing observations will give additional constraints. If the companion is a white dwarf or main sequence star, optical observations may yield a direct detection of the companion. If the system is indeed one of the few known double neutron star systems, it would lie significantly far from the recently proposed spin-period/eccentricity relationship.

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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