The brightest pure-H ultracool white dwarf

The brightest pure-H ultracool white dwarf
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最亮的纯H超冷白矮星

DOI:
10.1051/0004-6361/201220191
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发表时间:
2012
影响因子:
6.5
通讯作者:
Catalán S
Catalán S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Catalán S

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我们报告了在英国红外望远镜红外深空探测(UKIDSS)大面积探测(LAS)中发现的LSR J0745+2627是一颗冷白矮星,其运动学和年龄与厚盘/晕种群相适应。LSR-J0745+2627在J波段有较高的自行(890 Ma/年)和较高的折合自行(HJ=621.87)。我们展示了红外折合自行图如何用于选择低污染的冷白矮星样本。斯隆数字巡天卫星(SDSS)和广域红外巡天探测器(WISE)也探测到LSR J0745+2627。我们已经用甚大望远镜上的X-Shooter从光谱上确认了这个天体是一颗凉爽的白矮星。对它的光谱能量分布的详细分析表明,它的大气符合纯H组成模型,有效温度为3880K±990K。这是迄今发现的最亮的纯H超冷白矮星。我们考虑了不同的表面重力,限制了距离(24-45PC)、空间速度和年龄。结果表明,LSRJ0745+2627属于厚盘/晕群,也是最接近的超冷白矮星之一。
We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo population. LSR J0745+2627 has a high proper motion (890 mas/yr) and a high reduced proper motion value in theJband (HJ= 21.87). We show how the infrared-reduced proper motion diagram is useful for selecting a sample of cool white dwarfs with low contamination. LSR J0745+2627 is also detected in the Sloan Digital Sky Survey (SDSS) and the Wide-field Infrared Survey Explorer (WISE). We have spectroscopically confirmed this object as a cool white dwarf using X-Shooter on the Very Large Telescope. A detailed analysis of its spectral energy distribution reveals that its atmosphere is compatible with a pure-H composition model with an effective temperature of 3880 ± 90 K. This object is the brightest pure-H ultracool white dwarf (Teff< 4000 K) ever identified. We have constrained the distance (24–45 pc), space velocities and age considering different surface gravities. The results obtained suggest that LSR J0745+2627 belongs to the thick-disk/halo population and is also one of the closest ultracool white dwarfs.
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