| 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.
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 2009-04 | |
| 卷号 | 497期号:2页码:619-633 |
| DOI | 10.1051/0004-6361/200810314 |
| 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 |
| ISSN | 0004-6361 |
| 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 |
| 引用统计 | |
| 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 |
| 推荐引用方式 GB/T 7714 | 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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| Ultra-cool dwarfs_ n（1493KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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