在太阳10 pc范围内发现一个不寻常的蓝L矮星
Discovery of An Unusually Blue L Dwarf Within 10 pc of the Sun
摘要：
我们报告发现一个不寻常的蓝色L5矮星10 pc的太阳从斯隆数字巡天（SDSS）光谱搜索。光谱距离估计为8.0+/-1.6 pc，将SDSS J141624.08+134826.7列入六个最近的已知L矮星之列。SDSS 1416+13在基于红外颜色的搜索中被忽略，因为它的颜色是不寻常的蓝色J-K_S，这也表明它是蓝L矮星子类中最接近的成员。我们提出了额外的红外和光学光谱从IRTF/SpeX和麦哲伦/MagE光谱仪，并确定UVW运动，表明薄盘运动学。在20 pc的L矮星样本中包含SDSS 1416+13，使L5矮星的数量增加了20%，这表明L矮星的光度函数可能还远未完成。
英文摘要：
We report the discovery of an unusually blue L5 dwarf within 10 pc of the Sun from a search of Sloan Digital Sky Survey (SDSS) spectra. A spectrophotometric distance estimate of 8.0+/-1.6 pc places SDSS J141624.08+134826.7 among the six closest known L dwarfs. SDSS 1416+13 was overlooked in infrared color-based searches because of its unusually blue J-K_S color, which also identifies it as the nearest member of the blue L dwarf subclass. We present additional infrared and optical spectroscopy from the IRTF/SpeX and Magellan/MagE spectrographs and determine UVW motions that indicate thin disk kinematics. The inclusion of SDSS 1416+13 in the 20 pc sample of L dwarfs increases the number of L5 dwarfs by 20% suggesting that the L dwarf luminosity function may be far from complete.
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