LAMOST-K2天区矮星参数和APOGEE参数的比较

The comparison of stellar parameters in K2 fields between LAMOST and APOGEE

近十几年,越来越多的地面光谱巡天项目与空间测光数据结合用于研究星系和恒星.相关地面观测数据主要来自于如APOGEE,Gaia-ESO,GALAH,RAVE和LAMOST等项目.这些数据被用来获取准确的恒星大气参数和化学元素丰度.以上这些巡天项目的成功主要依赖于高效的光谱获取能力,以及所提供的高精度恒星参数.利用恒星光谱数据可以得到它们的有效温度、表面重力加速度、金属丰度和多种化学元素的丰度.基于这些恒星参数,可以估计确定恒星的质量和半径.这些参数有助于研究银河系的形成和演化.此外可靠的恒星质量和半径对于探测系外行星及其宿主星的性质有重要意义.比较两个数据库之间恒星参数可有效地估计光谱数据的质量,及了解不同数据库恒星参数的偏差.研究结果对改进光谱分析软件有重要作用.

In recent decades,more and more spectroscopic survey data combined with space-based photometry data have been used in the study of galaxies and stars.The relevant data mainly come from the ground-based projects such as APOGEE,Gaia-ESO,GALAH,RAVE,and LAMOST.It is supported that the accuracy of these data is sufficient to obtain the stellar accurate basic parameters and abundances of chemical elements.The success of these above-mentioned survey projects mainly depends on the high-precision stellar parameters provided by the efficient spectral analysis technology in the shortest calculation time,from the spectral data.One can get the effective temperature,surface gravitational acceleration,metal abundance and the chemical abundance of some elements.In addition,one can use these stellar parameters to estimate the mass and radius of the stars.In addition,the accurate stellar mass and radius are of great significance for the study of exoplanets and their host stars.The comparison between two different datasets will help evaluating the quality of those data.One can also update those pipelines based on the feedback of the results.