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Fixing the reference frame for PPMXL proper motions using extragalactic sources

Research in Astronomy and Astrophysics 2015年第6期15卷 849-859页

作者： Kathleen Grabowski j.ffrey L. Carlin heidi j. newberg Timothy C. Beers Li Chen Li-Cai Deng Carl j. Grillmair Puragra Guhathakurta j.n-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 Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute 110 8th Street Troy NY 12180 USA Department of Physics and j.NA: j.int Institute for Nuclear Astrophysics University of Notre Dame 225 Nieuwland Science Hall Notre Dame IN 46556 USA Shanghai Astronomical Observatory Key Lab of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Spitzer Science Center 1200 E. California Blvd. Pasadena CA 91125 USA UCO/Lick Observatory Department of Astronomy and Astrophysics University of CaliforniaSanta Cruz CA 95064 USA Nanj.ng Institute of Astronomical Optics & Technology National Astronomical ObservatoriesChinese Academy of Sciences Department of Physics and Astronomy Georgia State University 25 Park Place Suite 605Atlanta GA 30303 USA Kavli Institute for Astronomy and Astrophysics Peking University Department of Astronomy Peking University Fermi National Accelerator Laboratory P.O. Box 500 Batavia IL 60510 USA Department of Physics and Astronomy University of Utah

We quantify and correct systematic errors in PPMXL proper motions using extragalactic sources from the first two LAMOST data releases and the Vbron-Cetty ＆ Vebron Catalog of Quasars. Although the maj.rity of the sources are from the Veron 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 obj.cts in bins of 3° ×3° and present a table of proper motion corrections.

关键词： catalogs -- proper motions -- surveys LAMOST

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LAMOST Experiment for Galactic Understanding and Exploration (LEGUE)——The survey's science plan

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Research in Astronomy and Astrophysics 2012年第7期12卷 735-754页

作者： Li-Cai Deng heidi j. newberg Chao Liu j.ffrey L. Carlin Timothy C. Beers Li Chen Hsu-Tai Lee Carl j. Grillmair Puragra Guhathakurta] Zhan-Wen Han j.n-Liang Hou Sebastien Lepine j.ng 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 Key Lab for Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China licai@*** Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute 1108th Street Troy NY 12180 USA National Optical Astronomy Observatory Tucson AZ 85719 USA Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Institute of Astronomy and Astrophysics Academia Sinica EO. Box 23-141 Taipei 106 China University of Heidelberg Landessternwarte K6nigstuhl 12 D-69117 Heidelberg Germany Spitzer Science Center 1200 E. California Blvd. Pasadena CA 91125 USA Department of Astronomy and Astrophysics University of California Santa Cruz 1156 HighStreet Santa Cruz CA 95064 USA Yunnan Astronomical Observatory Chinese Academy of Sciences Kunming 650011 China American Museum of Natural History Central Park West at 79th Street New York NY 10024USA School of Physics and Electronic Information China West Normal University Nanchong637000 China ' Department of Astronomy & Kavli Institute of Astronomy and Astrophysics Peking University Beijing 100871 China Apache Point Observatory PO Box 59 Sunspot NM 88349 USA Department of Physics and Astronomy Rutgers University 136 Frelinghuysen RoadPiscataway NJ 08854-8019 USA Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Fermi National Accelerator Laboratory Batavia IL 60510 USA Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 USA School of Astronomy and Space Science Nanjing University Nanjing 210008 China

We describe the current plans for a spectroscopic survey of millions of stars in the Milky Way galaxy using the Guo Shou j.ng Telescope （GSj., formerly calledthe Large sky Area Multi-Obj.ct 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~ 〈 di 〈 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.

关键词： techniques: spectroscopic -Galaxy: structure - Galaxy: evolution -Galaxy: kinematics and dynamics -- Galaxy: disk -- Galaxy: halo -- spectroscopy

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An algorithm for preferential selection of spectroscopic targets in LEGUE

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Research in Astronomy and Astrophysics 2012年第7期12卷 755-771页

作者： j.ffrey L. Carlin Sebastien Lepine heidi j. newberg Li-Cai Deng Timothy C. Beers Yu-Qin Chen Norbert Christlie Xiao-Ting Fu Shuang Gao Carl j. Grillmair PuragraGuhathakurta Zhan-Wen Han j.n-Liang Hou Hsu-Tai Lee j.ng 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 Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute 110 8th Street Troy NY 12180 USA carlij.rpi.edu Department of Astrophysics American Museum of Natural History Central Park West at 79thStreet New York NY 10024 USA City University of New York 365 Fifth Avenue New York NY 10016 USA National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China National Optical Astronomy Observatory Tucson AZ 85719 USA Center for Astronomy University of Heidelberg Landesstemwarte Ktinigstuhl 12 D-69117Heidelberg Germany Spitzer Science Center 1200 E. California Blvd. Pasadena CA 91125 USA j.O/Lick Observatory Department of Astronomy and Astrophysics University of CaliforniaSanta Cruz CA 95064 USA Yunnan Astronomical Observatory Chinese Academy of Sciences Kunming 650011 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanglai 200030 China Institute of Astronomy and Astrophysics Academia Sinica EO. Box 23-141 Taipei 106 China Department of Astronomy & Kavli institute of Astronomy and Astrophysics Peking UniversityBeijing 100875 China Apache Point Observatory PO Box 59 Sunspot NM 88349 USA Department of Physics and Astronomy Rutgers University 136 Frelinghuysen RoadPiscataway NJ 08854-8019 USA Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Fermi National Accelerator Laboratory EO. Box 500 Batavia IL 60510 USA Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 USA Department of Astronomy Nanjing University Nanjing 210011 China

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 obj.cts to be observed. This routine aims to achieve a balance between a smoothly- varying, well-understood selection function and the desire to preferentially select cer- tain types of targets. Some target-selection examples are shown that illustrate differentpossibilities 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 j.ng 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.

关键词： surveys: LAMOST -- Galaxy: halo -- techniques: spectroscopic

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湿粗石油贮器中蒸汽的腐蚀(文摘)

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化学世界 1957年第10期 477-477页

作者：杨琮

本文研究粗石油贮器发生腐蚀的原由,以及防止金属毁损的方法。腐蚀发生在顶盖内面,原因是钢和H2S在湿气存在下互相作用,生成FeS和H2。随着硫化物的

关键词：石油矿物燃料底上

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