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Ages and masses of 0.64 million red giant branch stars from the LAMOST Galactic Spectroscopic Survey

文献类型：期刊论文

作者Wu, Yaqian1,2; Xiang, Maosheng1,3; Zhao, Gang1; Bi, Shaolan2; Liu, Xiaowei4; Shi, Jianrong1; Huang, Yang4; Yuan, Haibo2; Wang, Chun5; Chen, Bingqiu4
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2019-04-01
卷号484期号:4页码:5315-5329
关键词Galaxy: abundances Galaxy: fundamental parameters stars
ISSN号0035-8711
DOI10.1093/mnras/stz256
英文摘要We present a catalogue of stellar age and mass estimates for a sample of 640 986 red giant branch (RGB) stars of the Galactic disk from the LAMOST Galactic Spectroscopic Survey (DR4). The RGB stars are distinguished from the red clump (RC) stars utilizing period spacing derived from the spectra with a machine-learning method based on kernel principal component analysis (KPCA). Cross-validation suggests our method is capable of distinguishing RC from RGB stars with an only 2 per cent contamination rate for stars with signal-to-noise ratio (SNR) higher than 50. The ages and masses of these RGB stars are determined from their LAMOST spectra with the KPCA method by taking the LAMOST-Kepler giant stars having asteroseismic parameters and the LAMOST-TGAS sub-giant stars based on isochrones as training sets. Examination suggests that the age and mass estimates of our RGB sample stars with SNR > 30 have a median error of 30 per cent and 10 per cent, respectively. Stellar ages are found to exhibit positive vertical and negative radial gradients across the disk, and the age structure of the disk is strongly flared across the whole disk of 6 < R < 13 kpc. The data set demonstrates good correlations among stellar age, [Fe/H], and [alpha/Fe]. There are two separate sequences in the [Fe/H]-[alpha/Fe] plane: a high-alpha sequence with stars older than similar to 8Gyr and a low-alpha sequence composed of stars with ages covering the whole range of possible ages of stars. We also examine relations between age and kinematic parameters derived from the Gaia DR2 parallax and proper motions. Both the median value and dispersion of the orbital eccentricity are found to increase with age. The vertical angular momentum is found to fairly smoothly decrease with age from 2 to 12 Gyr, with a rate of about - 50 kpc km s(-1) Gyr(-1). A full table of the catalogue is publicly available online http://dr4.lamost.org/doc/vac.
WOS关键词OLD OPEN CLUSTERS ; STELLAR ATMOSPHERIC PARAMETERS ; METALLICITY GRADIENTS ; CHEMICAL EVOLUTION ; DATA RELEASE ; DISK ; M67 ; NGC-188 ; BERKELEY-32 ; CALIBRATION
资助项目National Natural Science Foundation of China (NSFC)[U1631236] ; National Natural Science Foundation of China (NSFC)[11390371] ; Chinese Academy of Sciences (CAS)[U1631236] ; National Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China[U1531244] ; NSFC[11703035] ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000462414400062
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
源URL[http://ir.bao.ac.cn/handle/114a11/25732]  
专题中国科学院国家天文台
通讯作者Wu, Yaqian; Xiang, Maosheng; Zhao, Gang
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
3.Max Planck Inst Astron, D-69117 Heidelberg, Germany
4.Yunnan Univ, South West Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
5.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Yaqian,Xiang, Maosheng,Zhao, Gang,et al. Ages and masses of 0.64 million red giant branch stars from the LAMOST Galactic Spectroscopic Survey[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(4):5315-5329.
APA Wu, Yaqian.,Xiang, Maosheng.,Zhao, Gang.,Bi, Shaolan.,Liu, Xiaowei.,...&Zhang, Jinghua.(2019).Ages and masses of 0.64 million red giant branch stars from the LAMOST Galactic Spectroscopic Survey.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(4),5315-5329.
MLA Wu, Yaqian,et al."Ages and masses of 0.64 million red giant branch stars from the LAMOST Galactic Spectroscopic Survey".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.4(2019):5315-5329.

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