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首页> 外文期刊>The Astrophysical journal >DISCOVERY OF A NEARBY HALO WHITE DWARF WITH PROPER MOTION μ = 2.55″ yr~(-1)
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DISCOVERY OF A NEARBY HALO WHITE DWARF WITH PROPER MOTION μ = 2.55″ yr~(-1)

机译：正确运动附近的光晕白矮星的发现μ= 2.55英寸年〜（-1）

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摘要

We report the discovery of PM J13420-3415, a faint (V = 17) white dwarf with a very high proper motion μ = 2.55″ yr~(-1). The star was found in the southern sky extension of the SUPERBLINK proper-motion survey. A red spectrum shows the classical signature of a DA white dwarf, with a weak Hα line in absorption as the only prominent feature. The star is also found to have a large radial velocity V_(rad) = +212 ± 15 km s~(-1). At the adopted distance of 18 pc, the star has a very large space motion of 313 km s~(-1) relative to the Sun. An integration of the space motion shows that the star is on a nearly polar Galactic orbit and is thus an unambiguous member of the Galactic halo. However, with an estimated effective temperature 5000 K < T_(eff) < 5500 K, the white dwarf appears to be much younger than expected for a denizen of the halo. The apparent paradox can be explained if the white dwarf is the relatively young (～2 Gyr) remnant of a longer lived (10-14 Gyr) main-sequence star, in which case the object is predicted to be a low-mass white dwarf with M ≈ 0.45 solar mass.
机译：我们报告发现了PM J13420-3415，这是一个微弱的（V = 17）白矮星，具有很高的固有运动μ= 2.55“ yr〜（-1）。这颗恒星是在SUPERBLINK正常运动调查的南部天空延伸部分发现的。红色光谱显示DA白矮星的经典特征，吸收中弱的Hα线是唯一突出的特征。还发现该恒星具有较大的径向速度V_（rad）= +212±15 km s〜（-1）。在采用的18 pc距离下，恒星相对于太阳的空间运动非常大，为313 km s〜（-1）。对空间运动的积分表明，该恒星在近乎极性的银河轨道上，因此是银河晕的唯一成员。但是，在估计的有效温度5000 K

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