YNAO OpenIR  > 大样本恒星演化研究组
Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
Zhang CH(张曾华)1,2,3; Pokorny, RS1; Jones, HRA3; Pinfield, DJ3; Chen PS(陈培生)1; Han ZW(韩占文)1; Chen D(陈东)1,3; Galvez-Ortiz, MC3; Burningham, B3; Zhang, ZH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊ASTRONOMY & ASTROPHYSICS
2009-04
卷号497期号:2页码:619-633
DOI10.1051/0004-6361/200810314
产权排序第1完成单位
收录类别SCI ; EI
关键词Stars: Late-type Stars: Low-mass Brown Dwarfs
摘要Aims. We try to identify ultra-cool dwarfs from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with SDSS i-z and r-z colors. We also obtain proper motion data from SDSS, 2MASS, and UKIDSS and improve spectral typing from SDSS and 2MASS photometric colors. Methods. We selected ultra-cool dwarf candidates from the SDSS DR7 with new photometric selection criteria, which are based on a parameterization study of known L and T dwarfs. The objects are then cross-identified with the Two Micron All Sky Survey and the Fourth Data Release of the UKIRT Infrared Deep Sky Survey (UKIDSS DR4). We derive proper motion constraints by combining SDSS, 2MASS, and UKIDSS positional information. In this way we are able to assess, to some extent, the credence of our sample using a multi epoch approach, which complements spectroscopic confirmation. Some of the proper motions are affected by short baselines, but, as a general tool, this method offers great potential to confirm faint L dwarfs as UKIDSS coverage increases. In addition we derive updated color-spectral type relations for L and T dwarfs with SDSS and 2MASS magnitudes. Results. We present 59 new nearby M and L dwarfs selected from the imaging catalog of the SDSS DR7, including proper motions and spectral types calculated from the updated color-spectral type relations. and obtain proper motions from SDSS, 2MASS, and UKIDSS for all of our objects.
项目资助者Alfred P. Sloan Foundation ; Participating Institutions ; National Science Foundation ; U. S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England ; Natural Science Foundation of China [10521001, 10433030, 10503010] ; CAS Research Fellowship
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
归档日期2009-04-26
WOS记录号WOS:000265097300034
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; EARLY DATA RELEASE ; LARGE-AREA SURVEY ; T-DWARFS ; BROWN DWARFS ; UKIDSS ; NEIGHBORS ; FIELD ; CLASSIFICATION ; SPECTROSCOPY
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被引频次:46[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/4476
专题大样本恒星演化研究组
通讯作者Zhang, ZH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, PR China
2.Graduate School of Chinese Academy of Sciences, Beijing 100049, PR China
3.Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
第一作者单位中国科学院云南天文台
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Zhang CH,Pokorny, RS,Jones, HRA,et al. Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors[J]. ASTRONOMY & ASTROPHYSICS,2009,497(2):619-633.
APA Zhang CH.,Pokorny, RS.,Jones, HRA.,Pinfield, DJ.,Chen PS.,...&Zhang, ZH .(2009).Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors.ASTRONOMY & ASTROPHYSICS,497(2),619-633.
MLA Zhang CH,et al."Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors".ASTRONOMY & ASTROPHYSICS 497.2(2009):619-633.
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