An Overview of LAMOST DR2 钟靖 上海天文台
VB(9.0<r<14.0) 3*10m B (14.0<r<16.3) 3*20m M(16.3<r<17.8) 3*30m F(17.8<r<18.5) 3*30m
原始二维光谱 一维光谱 恒星参数及星表 3500*1934=676.9万 413.6万 220.7万 2D pipeline:减本底、除平场、追迹、抽谱、波长定标、减天光、流量定标 原始二维光谱 1D pipeline(LASP): 1.CFI方法,基于ATLAS9参数模型和观测光谱做相关,确定初始值 2.UlySS方法,通过对ELODIE恒星库插值运算来构建模板光谱,利用chisq拟合确定恒星参数 一维光谱 恒星参数及星表 Luo et al. 2012. RAA,12, 1243 Wu et al. 2014 arXiv:1407.1980 3500*1934=676.9万 413.6万 220.7万
距离模数 运动学 宇宙学距离 颜色 光谱类型 巨星/矮星 年龄、演化 物质组成 2D 1D Spectral type RV Redshift 运动学 宇宙学距离 Teff 颜色 光谱类型 Log g 巨星/矮星 Fe/H 年龄、演化 物质组成 2D 1D
413.6万 220.7万
LAMOST 2D pipeline 给出的光谱型不可靠 F G K LAMOST 2D pipeline 给出的光谱型不可靠
Stellar parameters (around 2,165,200 spectrum)
-0.02± 0.13 dex (Astroseismology) Xiang M.S. Gao H. Wang W. Dong S. RV 1.2±3.1 km/s -3.78±4.91 km/s Teff 7± 133 K 11± 110 K -36 ± 108 K Log g 0.02± 0.22dex 0.03± 0.19 dex -0.02± 0.13 dex (Astroseismology) FeH 0.06± 0.14dex 0.01± 0.11 dex 0.02 ± 0.11 dex 0.02 ± 0.015 dex
与其他星表的匹配 测光数据: Pan-STARRs( g,r,i,z,y) 2MASS (J,H,Ks) WISE (w1,w2) 自行数据: PPMXL 或 UCAC4 高分辨率光谱: APOGEE 高精度测光: Kepler
LAMOST Experiment for Galactic Understanding and Exploration (LEGUE)
子样本选取及分类 主序-白矮双星 28 WDMS in pilot survey Ren et al. 2013,AJ,146,82 121 WDMS in DR1 Ren et al. 2014,AA,570,107 DA白矮星 70 DA WDs in pilot survey Zhao et al. 2013,AJ,145,169 2964 DA WDS in pilot survey Zhang et al. 2013,AJ,146,34 M矮星 58360 M dwarfs in pilot survey Yi et al. 2014,AJ,147,33 2612 M dwarfs in commissioning data Zhong et al .2015a, AJ, submitted K 巨星 298036 K giants in DR1 Liu et al. 2014,ApJ,790,110 M巨星 8276 M giants in DR1 Zhong et al .2015b, RAA,submitted Be 星 190 Be stars in DR1 Lin et al.2015,RAA,submitted 红团簇星 120000 RC in DR2 Wan et al.2015,RAA,submitted
特殊天体的发现 183 Carbon stars Si et al. 2015, RAA 9 Metal pool stars Li et al.2010,RAA,10,753 36 Planetary nebulae Yuan et al.2010, RAA,10,599 1 B-type HVS Zheng et al.2014,ApJL,788,L37 28 Late-type HVSs Zhong et al. 2014,ApJL,789,L2 19 low mass HVSs Li et al.RAA, submitted 15 Mg-poor metal poor stars Xing et al. RAA,submitted
太阳邻域运动学结构 15000 F/G dwarf stars in pilot survey to map the U-V velocity distribution Xia et al.2015,MNRAS,447,236 Three “phase-space overdensities” are identified by using 7993 F, G, and K nearby main-sequence stars with estimates of position and space velocity. Zhao et al. ApJ,787,31 200,000 FGK main-sequence stars from the DR1to map the local stellar kinematics, and find that the stars with Teff> 6000K show a net asymmetric motion in all three orientations. (U, V, W)=(9.58±1.44, 13.77±0.68, 7.01±0.62) km/s Tian et al . ApJ,submitted
成员星判定: Zhang et al. RAA 径向迁移: Liu et al. ApJL 双星比例: Gao et al. 2014,ApJ,788,L37 晕星流: Zhao et al. RAA U band 变星: Cao et al. RAA …
总结 LAMOST星表可用的信息主要是 RV、Teff、Log g、FeH Value-added catalog Special objects Kinematic structures in the solar vicinity