Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
文献类型：期刊论文
| 作者 | 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
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2009-04 |
| 卷号 | 497期号:2页码:619-633 |
| 关键词 | stars: low-mass, brown dwarfs stars: late-type |
| ISSN号 | 0004-6361 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Zhang, ZH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; EARLY DATA RELEASE ; LARGE-AREA SURVEY ; T-DWARFS ; BROWN DWARFS ; UKIDSS ; NEIGHBORS ; FIELD ; CLASSIFICATION ; SPECTROSCOPY |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2009/14/aa10314-08/aa10314-08.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000265097300034 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4476]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 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 |
| 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.,...&Burningham, B.(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. |
入库方式： OAI收割
来源：云南天文台
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