我们最近的1500万个邻居：低质量恒星的光度和质量函数
Our Nearest 15 Million Neighbors: The Field Low-Mass Stellar Luminosity and Mass Functions
摘要：
利用斯隆数字巡天（SDSS）测光技术，对低质量矮星的光度函数（LF）和质量函数（MF）进行了新的测量。最终的星表由大约1500万颗低质量恒星（0.1 Msun < M < 0.8 Msun）组成，分布在8，400平方度的范围内。到恒星的距离估计使用新的光度视差关系，从附近的低质量恒星与三角视差乌格利兹测光构造。LF测量与一种新的技术，它同时测量银河系的结构和恒星LF。将所得LF与以前的研究进行比较，并转换为MF。MF由对数正态分布良好描述，Mo = 0.27 Msun。
英文摘要：
We report on a new measurement of the luminosity function (LF) and mass function (MF) of field low-mass dwarfs using Sloan Digital Sky Survey (SDSS) photometry. The final catalog is composed of ~15 million low-mass stars (0.1 Msun < M < 0.8 Msun), spread over 8,400 square degrees. Distances to the stars are estimated using new photometric parallax relations, constructed from ugriz photometry of nearby low-mass stars with trigonometric parallaxes. The LF is measured with a novel technique, which simultaneously measures Galactic structure and the stellar LF. The resulting LF is compared to previous studies and converted to a MF. The MF is well-described by a log-normal distribution, with Mo = 0.27 Msun.
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