斯隆数字巡天数据发布7分光m矮星目录iii：星系中磁活动的空间依赖性
The Sloan digital sky survey data release 7 spectroscopic m dwarf catalog iii: The spatial dependence of magnetic activity in the galaxy
摘要：
我们分析了斯隆数字巡天（SDSS）数据发布7的59，318 M矮星的磁活动。这项分析探讨了M矮星活动的空间分布，它是与银河平面垂直距离（Z）和与银河中心平面距离（R）的函数。我们证实了既定的趋势，减少磁活动（H-α发射测量）与增加距离的中间平面的磁盘，并找到证据的趋势银河系中心半径。我们测量一个非零的径向梯度的活动部分在我们的分析与光谱类型dM 3和dM 4的恒星。活动分数增加与R，可以解释为减少平均恒星年龄与银河系中心的距离增加。
英文摘要：
We analyze the magnetic activity of 59,318 M dwarfs from the Sloan Digital Sky Survey (SDSS) Data Release 7. This analysis explores the spatial distribution of M dwarf activity as a function of both vertical distance from the Galactic plane (Z) and planar distance from the Galactic center (R). We confirm the established trends of decreasing magnetic activity (as measured by H-alpha emission) with increasing distance from the mid-plane of the disk and find evidence for a trend in Galactocentric radius. We measure a non-zero radial gradient in the activity fraction in our analysis of stars with spectral types dM3 and dM4. The activity fraction increases with R and can be explained by a decreasing mean stellar age with increasing distance from the Galactic center.
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