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| 1 | LAMOST Experiment for Galactic Understanding and Exploration (LEGUE)——The survey's science plan显示文摘We describe the current plans for a spectroscopic survey of millions of stars in the Milky Way galaxy using the Guo Shou Jing Telescope (GSJT, formerly called the Large sky Area Multi-Object fiber Spectroscopic Telescope - LAMOST). The survey will obtain spectra for 2.5 million stars brighter than r < 19 during dark/grey time, and 5 million stars brighter than r < 17 or J < 16 on nights that are moonlit or have low transparency. The survey will begin in the fall of 2012, and will run for at least four years. The telescope's design constrains the optimal declination range for observations to 10 < δ < 50 , and site conditions lead to an emphasis on stars in the direction of the Galactic anticenter. The survey is divided into three parts with different target selection strategies: disk, anticenter, and spheroid. The resulting dataset will be used to study the merger history of the Milky Way, the substructure and evolution of the disks, the nature of the first generation of stars through identification of the lowest metallicity stars, and star formation through study of open clusters and OB associations. Detailed design of the LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) survey will be completed in summer 2012, after a review of the results of the pilot survey. | Li-Cai Deng Heidi Jo Newberg Chao Liu Jeffrey L. Carlin Timothy C. Beers Li Chen Hsu-Tai Lee Carl J. Grillmair Puragra Guhathakurta] Zhan-Wen Han Jin-Liang Hou Sebastien Lepine Jing Li Xiao-Wei Liu Kai-Ke Pan J. A. Sellwood Bo Wang Hong-Chi Wang Fan Yang Brian Yanny Hao-Tong Zhang Yue-Yang Zhang Zheng Zheng Zi Zhu | 2012 | Research in Astronomy and Astrophysics2012，12，7： | 10 |
| 2 | An algorithm for preferential selection of spectroscopic targets in LEGUE显示文摘We describe a general target selection algorithm that is applicable to any survey in which the number of available candidates is much larger than the number of objects to be observed. This routine aims to achieve a balance between a smoothly- varying, well-understood selection function and the desire to preferentially select certain types of targets. Some target-selection examples are shown that illustrate different possibilities of emphasis functions. Although it is generally applicable, the algorithm was developed specifically for the LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) survey that will be carried out using the Chinese Guo Shou Jing Telescope. In particular, this algorithm was designed for the portion of LEGUE targeting the Galactic halo, in which we attempt to balance a variety of science goals that require stars at fainter magnitudes than can be completely sampled by LAMOST. This algorithm has been implemented for the halo portion of the LAMOST pilot sur- vey, which began in October 2011. | Jeffrey L. Carlin Sebastien Lepine Heidi Jo Newberg Li-Cai Deng Timothy C. Beers Yu-Qin Chen Norbert Christlie Xiao-Ting Fu Shuang Gao Carl J. Grillmair PuragraGuhathakurta Zhan-Wen Han Jin-Liang Hou Hsu-Tai Lee Jing Li Chao Liu Xiao-Wei Liu Kai-Ke Pan J. A. Sellwood Hong-Chi Wang Fan Yang Brian Yanny Yue-Yang Zhan Zheng Zheng Zi Zhu | 2012 | Research in Astronomy and Astrophysics2012，12，7： | 1 |
| 3 | Mapping the Stellar Structure of the Milky WayThick Disk and Halo Using SEGUE Photometry显示文摘 | DE JONG JELTE T A YANNY BRIAN RIX HANS-WALTER | 2010 | Astrophysical Journal2010，714，： | 1 |
| 4 | Fixing the reference frame for PPMXL proper motions using extragalactic sources显示文摘We quantify and correct systematic errors in PPMXL proper motions using extragalactic sources from the first two LAMOST data releases and the Ve`ron-Cetty& Ve`ron Catalog of Quasars. Although the majority of the sources are from the Ve`ron catalog, LAMOST makes important contributions in regions that are not well-sampled by previous catalogs, particularly at low Galactic latitudes and in the south Galactic cap. We show that quasars in PPMXL have measurable and significant proper motions,which reflect the systematic zero-point offsets present in the catalog. We confirm the global proper motion shifts seen by Wu et al., and additionally find smaller-scale fluctuations of the QSO-derived corrections to an absolute frame. We average the proper motions of 158 106 extragalactic objects in bins of 3?× 3?and present a table of proper motion corrections. | Kathleen Grabowski Jeffrey L. Carlin Heidi Jo Newberg Timothy C. Beers Li Chen Li-Cai Deng Carl J. Grillmair Puragra Guhathakurta Jin-Liang Hou Yong-Hui Hou Se'bastien Le'pine Chao Liu Xiao-Wei Liu A-Li Luo Martin C. Smith Brian Yanny Hao-Tong Zhang Yong Zhang Zheng Zheng | 2015 | Research in Astronomy and Astrophysics2015，15，6： | 0 |
| 5 | Candidate members of the Pal 5, GD-1, Cetus Polar and Orphan tidal stellar halo streams from SDSS DR9, LAMOST DR3 and APOGEE catalogs显示文摘We present candidate members of the Pal 5,GD-1,Cetus Polar and Orphan tidal stellar streams found in LAMOST DR3,SDSS DR9 and APOGEE catalogs.In LAMOST DR3,we find 20,4 and 24 high confidence candidates of tidal streams GD-1,Cetus Polar and Orphan respectively.We also list 59,118 and 10 high confidence candidates of tidal streams Cetus Polar,Orphan and Pal 5,respectively from the SDSS DR9 spectroscopic catalog.Furthermore,we find seven high confidence candidates of the Pal 5 tidal stream in the APOGEE data.Compared with SDSS,the new candidates from LAMOST DR3 are brighter,so that together,more of the color-magnitude diagram,including the giant branch,can be explored.Analysis of the SDSS data shows that there are three metallicity peaks associated with the Orphan stream which also exhibit some spatial separation.The LAMOST data confirm multiple metallicities in this stream.The metallicity,given by the higher resolution APOGEE instrument,of the Pal 5 tidal stream is [Fe/H] ^-1.2,higher than that given earlier by SDSS spectra.Many previously unidentified stream members are tabulated here for the first time,along with existing members,allowing future researchers to further constrain the orbits of these objects as they move within the Galaxy's dark matter potential. | Guang-Wei Li Brian Yanny Hao-Tong Zhang Zong-Rui Bai Yue Wu Yi-Qiao Dong Ya-Juan Lei Hai-Long Yuan Yong-Hui Hou Yue-Fei Wang Yong Zhang | 2017 | Research in Astronomy and Astrophysics2017，17，6： | 0 |
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