New nearby, bright southern ultracool dwarfs
文献类型：期刊论文
| 作者 | Kendall, TR; Jones, HRA; Pinfield, DJ; R. S. Pokorny; Folkes, S; Weights, D; Jenkins, JS; Mauron, N |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2007-01-11 |
| 卷号 | 374期号:2页码:445-454 |
| 关键词 | surveys stars : distances stars : kinematics stars : late-type stars : low-mass, brown dwarfs infrared : stars |
| ISSN号 | 0035-8711 |
| 产权排序 | 第二完成单位 |
| 通讯作者 | Kendall, TR (reprint author), Univ Hertfordshire, Ctr Astrophys Res, Sci & Technol Res Inst, Coll Lane, Hatfield AL10 9AB, Herts, England. |
| 英文摘要 | We report the discovery of 21 hitherto unknown bright southern ultracool dwarfs with spectral types in the range M7 to L5.5, together with new observations of a further three late M dwarfs previously confirmed. Three more objects are already identified in the literature as high proper motion stars; we derive their spectral types for the first time. All objects were selected from the Two Micron All-Sky Survey (2MASS) all-sky and SuperCOSMOS point source data bases on the basis of their optical/near-infrared colours, J-band magnitudes and proper motions. Low-resolution (R similar to 1000) JH spectroscopy with the European Southern Observatory (ESO)/New Technology Telescope (NTT) Son of Isaac (SOFI) spectrograph has confirmed the ultracool nature of 24 targets, out of a total of 25 candidates observed. Spectral types are derived by direct comparison with template objects and compared to results from H(2)O and FeH indices. We also report the discovery of one binary, as revealed by SOFI acquisition imaging; spectra were taken for both components. The spectral types of the two components are L2 and L4 and the distance similar to 19 pc. Spectroscopic distances and transverse velocities are derived for the sample. Two similar to L5 objects lie only at similar to 0 pc distant. Such nearby objects are excellent targets for further study to derive their parallaxes and to search for fainter, later companions with adaptive optics and/or methane imaging. |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | PROPER MOTION STARS ; DIGITAL SKY SURVEY ; SOLAR NEIGHBORHOOD ; SPECTROSCOPIC CLASSIFICATION ; INFRARED-SPECTRA ; COOL NEIGHBORS ; T-DWARFS ; DISCOVERY ; 2MASS ; SUBDWARF |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/374/2/445 |
| 语种 | 英语 |
| WOS记录号 | WOS:000243792100007 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4442]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 推荐引用方式 GB/T 7714 | Kendall, TR,Jones, HRA,Pinfield, DJ,et al. New nearby, bright southern ultracool dwarfs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,374(2):445-454. |
| APA | Kendall, TR.,Jones, HRA.,Pinfield, DJ.,R. S. Pokorny.,Folkes, S.,...&Mauron, N.(2007).New nearby, bright southern ultracool dwarfs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,374(2),445-454. |
| MLA | Kendall, TR,et al."New nearby, bright southern ultracool dwarfs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 374.2(2007):445-454. |
入库方式： OAI收割
来源：云南天文台
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