APPLICATION OF THE SEGUE STELLAR PARAMETER PIPELINE TO LAMOST STELLAR SPECTRA

被引：28

作者：

Lee, Young Sun ^{[1
]}

Beers, Timothy C. ^{[2
,3
]}

Carlin, Jeffrey L. ^{[4
,5
]}

Newberg, Heidi J. ^{[4
]}

Hou, Yonghui ^{[6
]}

Li, Guangwei ^{[7
]}

Luo, A. -Li ^{[7
]}

Wu, Yue ^{[7
]}

Yang, Ming ^{[7
]}

Zhang, Haotong ^{[7
]}

Zhang, Wei ^{[7
]}

Zhang, Yong ^{[6
]}

机构：

[1] Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134, South Korea

[2] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[3] Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA

[4] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

[5] Earlham Coll, Dept Phys & Astron, Richmond, IN 47374 USA

[6] Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China

[7] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

ASTRONOMICAL JOURNAL | 2015年 / 150卷 / 06期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

methods: data analysis; stars: abundances; techniques: imaging spectroscopy; DIGITAL SKY SURVEY; VELOCITY EXPERIMENT RAVE; 1ST SPECTROSCOPIC DATA; METAL-POOR STARS; DATA RELEASE; ATMOSPHERIC PARAMETERS; MILKY-WAY; TELESCOPE; ABUNDANCES; VALIDATION;

D O I：

10.1088/0004-6256/150/6/187

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe an application of the SEGUE Stellar Parameter Pipeline (SSPP) to medium-resolution stellar spectra obtained by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), in order to determine estimates of the stellar atmospheric parameters (T-eff, log g, and [Fe/H]) and the abundance ratios ([alpha/Fe] and [C/Fe]). By performing a coordinate match with the LAMOST stellar database, we selected stars with LAMOST spectra in common with stars having available spectroscopy from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), the RAdial Velocity Experiment (RAVE), and the Sloan Extension for Galactic Understanding and Exploration (SEGUE). We ran the selected LAMOST stellar spectra from each survey through SSPP, and compared the stellar parameters down to signal-to-noise ratio (S/N) of 10 and chemical abundances down to S/N = 20 derived by SSPP with those determined by the APOGEE, RAVE, and SEGUE software pipelines. Our results show that the derived stellar parameters generally agree quite well, even though there exist some small systematic offsets with small scatter in Teff, log g, and [Fe/H], due to the use of different temperature scales, abundance scales, and calibrations adopted by each survey. Comparison of the [alpha/Fe] determinations for LAMOST spectra suggests no sign of significant systematic offsets (<-0.04 dex), with a small scatter (<0.08 dex) relative to stars in common with APOGEE and SEGUE. The [C/Fe] estimates determined for the LAMOST spectra also exhibit good agreement, with a very small offset (similar to 0.01 dex) and scatter (similar to 0.12 dex) relative to the SEGUE stars, while there exists about a -0.19 dex offset, with a small scatter of similar to 0.13 dex, for the APOGEE sample. Due to the existence of small offsets in the stellar parameters and abundances among difference data sets, optimal results when combining the different data sets will be obtained by removing the offsets. Once accomplished, the stellar parameters and chemical abundances estimated by SSPP from the LAMOST stellar spectra should provide a reliable database for studies of the Galactic disk and halo systems.

引用

页数：18