ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS

	ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS
	Liu, Chao1 ; Fang, Min 2,3,4; Wu, Yue1 ; Deng, Li-Cai1 ; Wang, Liang1 ; Wang, Wei 1; Fu, Jian-Ning 5; Hou, Yong-Hui 6; Li, Guang-Wei1 ; Zhang, Yong 6
刊名	ASTROPHYSICAL JOURNAL
	2015-07-01
卷号	807 期号:1
关键词	asteroseismology methods: data analysis methods: statistical stars: fundamental parameters
英文摘要	Asteroseismology is one of the most accurate approaches to estimate the surface gravity of a star. However, most of the data from the current spectroscopic surveys do not have asteroseismic measurements, which is very expensive and time consuming. In order to improve the spectroscopic surface gravity estimates for a large amount of survey data with the help of the small subset of the data with seismic measurements, we set up a support vector regression (SVR) model for the estimation of the surface gravity supervised by 1374 Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) giant stars with Kepler seismic surface gravity. The new approach can reduce the uncertainty of the estimates down to about 0.1 dex, which is better than the LAMOST pipeline by at least a factor of 2, for the spectra with signal-to-noise ratio higher than 20. Compared with the log g estimated from the LAMOST pipeline, the revised log g values provide a significantly improved match to the expected distribution of red clump and red giant branch stars from stellar isochrones. Moreover, even the red bump stars, which extend to only about 0.1 dex in log g, can be discriminated from the new estimated surface gravity. The method is then applied to about 350,000 LAMOST metal-rich giant stars to provide improved surface gravity estimates. In general, the uncertainty of the distance estimate based on the SVR surface gravity can be reduced to about 12% for the LAMOST data.
收录类别	SCI
语种	英语
WOS记录号	WOS:000358945200004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5637]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Univ Autonoma Madrid, Fac Ciencias, Dept Fis Teor, E-28049 Madrid, Spain 3.Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 5.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 6.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Liu, Chao,Fang, Min,Wu, Yue,et al. ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS[J]. ASTROPHYSICAL JOURNAL,2015,807(1).
APA	Liu, Chao.,Fang, Min.,Wu, Yue.,Deng, Li-Cai.,Wang, Liang.,...&Zhang, Yong.(2015).ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS.ASTROPHYSICAL JOURNAL,807(1).
MLA	Liu, Chao,et al."ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS".ASTROPHYSICAL JOURNAL 807.1(2015).