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Low-Mass Stars in the Sloan Digital Sky Survey: Galactic Structure, Kinematics, and the Luminosity Function

机译:Sloan Digital Sky Sky的低质量恒星:银河结构,运动学和亮度功能

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Modern sky surveys, such as the Sloan Digital Sky Survey and the Two-Micron All Sky Survey, have revolutionized the study of low-mass stars. With millions of photometric and spectroscopic observations, intrinsic stellar properties can be studied with unprecedented statistical significance. Low-mass stars dominate the local Milky Way and are ideal tracers of the Galactic potential and the thin and thick disks. Recent efforts, driven by SDSS observations, have sought to place the local low-mass stellar population in a broader Galactic context. I highlight a recent measurement of the luminosity and mass functions of M dwarfs, using a new technique optimized for large surveys. Starting with SDSS photometry, the field luminosity function and local Galactic structure are measured simultaneously. The sample size used to estimate the LF is nearly three orders of magnitude larger than any previous study, offering a definitive measurement of this quantity. The observed LF is transformed into a mass function and compared to previous studies. Ongoing investigations employing M dwarfs as tracers of Galactic kinematics are also discussed. SDSS spectroscopy has produced databases containing tens of thousands of low-mass stars, forming a powerful probe of the kinematic structure of the Milky Way. SDSS spectroscopic studies are complemented by large proper motion surveys, which have uncovered thousands of common proper motion binaries containing low-mass stars. Additionally, the SDSS spectroscopic data explore the intrinsic properties of M dwarfs, including metallicity and magnetic activity. The highlighted projects demonstrate the advantages and problems with using large data sets and will pave the way for studies with next-generation surveys, such as PanSTARRS and LSST.
机译:现代天空调查,如斯隆数字天空调查和两微米的所有天空调查,彻底改变了对低质量恒星的研究。利用数百万光度测光和光谱观察,可以以前所未有的统计学意义研究了内在的恒星性质。低质量恒星主导了当地的银河系,是银河系潜力和薄圆盘的理想示踪剂。由SDSS观测结果驱动的最新努力试图将当地的低质量恒星种群放在更广泛的银河背景下。我突出了最近测量M矮种的发光度和质量功能,使用针对大型调查的新技术。从SDSS光度测量开始,同时测量场亮度函数和局部银河结构。用于估计LF的样本大小比以前的任何研究更大的数量级,提供了该数量的最终测量。观察到的LF转化成质量功能并与先前的研究相比。还讨论了雇用M矮人作为银河运动学的示踪剂的持续调查。 SDSS Spectrowpopt生产了包含数万个低质量恒星的数据库,形成了银河系的运动结构的强大探头。 SDSSSS光谱研究通过大量的运动调查互补,该调查已经未覆盖含有低质量恒星的普通适当的运动二进制文件。另外,SDSS光谱数据探讨了M矮种的内在特性,包括金属性和磁性活性。突出显示的项目展示了使用大型数据集的优势和问题,并将为下一代调查提供研究,例如Panstarrs和LSST。

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