Determination of Distance,Extinction,Mass,and Age for Stars in LAMOST DR7  

作　　者：Jianling Wang Zihuang Cao Yang Huang Haibo Yuan 

机构地区：[1]CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Beijing 100101,China [2]Department of Astronomy,Beijing Normal University,Beijing 100875.China

出　　处：《Research in Astronomy and Astrophysics》2023年第2期249-261,共13页天文和天体物理学研究（英文版）

基　　金：The Guo Shou Jing Telescope(the Large-sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST)is a National Major Scientific Project built by the Chinese Academy of Sciences.Funding for the project has been provided by the National Development and Reform Commission;supported by the National Natural Science Foundation of China(NSFC,Grant No.12073047)。

摘　　要：Large scale spectroscopic surveys such as that using Large-sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST) have collected spectra of millions stars in the Milky Way.Utilizing this huge sample of stars to study the assembling history and structure of our Galaxy requires accurate estimates of distance,extinction,age,and mass for individual stars.Combining the parallax constraint from Gaia EDR3 with Bayesian inference,we have estimated the distance and extinction for stars observed in LAMOST DR7,as well as the stellar mass and age for evolved stars in this data release.We validated the accuracies of the stellar parameters by comparing our results against various measurements,including the star-pair technique,asteroseismology,globular clusters,and isochrone fits to main sequence stars and subgiants.This is a valuable catalog of stellar parameters under a Bayesian framework estimated using the data from Gaia EDR3 and LAMOST spectroscopic data.With this data set we explored the stellar population of the Galactic massive substructure Gaia-Sausage-Enceladus(GSE).The kinematically selected members of GSE have a median metallicity of [Fe/H] =-1.29 and a median age of 11.6 Gyr.

关 键 词：STARS distances-stars fundamental parameters-stars kinematics and dynamics-Galaxy formation-(Galaxy:)globular clusters general 

分 类 号：P15[天文地球—天文学]