Optical Detection of a Variable Millisecond Pulsar Companion in 47 Tucanae
Optical Detection of a Variable Millisecond Pulsar Companion in 47 Tucanae
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DOI：
10.1086/323122
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发表时间：
2001-07
期刊：
影响因子：
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通讯作者：
P. Edmonds;Ronald L. Gilliland;C. Heinke;J. Grindlay;F. Camilo
中科院分区：
文献类型：
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作者：
P. Edmonds;Ronald L. Gilliland;C. Heinke;J. Grindlay;F. Camilo
利用对47颗杜卡纳星团的毫秒脉冲星的射电和X射线观测结果，以及对球状星团核心的扩展哈勃空间望远镜U、V和I成像，我们得到了一个一般的天体测量学解，其好于小于0。1.在射电和X射线探测到的0.429天轨道上的4.3ms脉冲星47TUCU，其MV=20.9蓝色恒星。对这一光学候选星的大量时间序列数据的分析表明，在射电星历预期的周期和相位上，光学变化有0.004毫克的半幅度变化，并且光学变化在空间上与候选光学变化一致。这为毫秒脉冲星的白矮星伴星提供了安全的光学探测，这是球状星团中的第一次这样的探测，允许与最近对此类伴星的质量和年龄相关的模型进行比较。
Using results from radio and X-ray observations of millisecond pulsars in 47 Tucanae, and extensive Hubble Space Telescope U, V, and I imaging of the globular cluster core, we have derived a common astrometric solution good to less than 0.″1. A close positional coincidence is found for 47 Tuc U, a 4.3 ms pulsar in a 0.429 day orbit, detected in radio and X-rays, with an mV = 20.9 blue star. Analysis of extensive time series data for this optical candidate shows a 0.004 mag semiamplitude variation at the period and phase expected from the radio ephemeris, and the optical variations are spatially coincident with the candidate. This provides secure optical detection of the white dwarf companion to the millisecond pulsar, the first such detection in a globular cluster, allowing for comparisons to recent models for such companions with dependencies on mass and age.