EFFICIENT SELECTION AND CLASSIFICATION OF INFRARED EXCESS EMISSION STARS BASED ON AKARI AND 2MASS DATA
文献类型：期刊论文
| 作者 | Huang, Ya Fang1; Li, Jin Zeng1; Rector, Travis A.2; Mallamaci, Carlos C.3 |
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2013-05-01 |
| 卷号 | 145期号:5 |
| 关键词 | H II regions stars: early-type stars: formation stars: pre-main sequence stars: variables: T Tauri, Herbig Ae/Be |
| 英文摘要 | The selection of young stellar objects (YSOs) based on excess emission in the infrared is easily contaminated by post-main-sequence stars and various types of emission line stars with similar properties. We define in this paper stringent criteria for an efficient selection and classification of stellar sources with infrared excess emission based on combined Two Micron All Sky Survey (2MASS) and AKARI colors. First of all, bright dwarfs and giants with known spectral types were selected from the Hipparcos Catalogue and cross-identified with the 2MASS and AKARI Point Source Catalogues to produce the main-sequence and the post-main-sequence tracks, which appear as expected as tight tracks with very small dispersion. However, several of the main-sequence stars indicate excess emission in the color space. Further investigations based on the SIMBAD data help to clarify their nature as classical Be stars, which are found to be located in a well isolated region on each of the color-color (C-C) diagrams. Several kinds of contaminants were then removed based on their distribution in the C-C diagrams. A test sample of Herbig Ae/Be stars and classical T Tauri stars were cross-identified with the 2MASS and AKARI catalogs to define the loci of YSOs with different masses on the C-C diagrams. Well classified Class I and Class II sources were taken as a second test sample to discriminate between various types of YSOs at possibly different evolutionary stages. This helped to define the loci of different types of YSOs and a set of criteria for selecting YSOs based on their colors in the near-and mid-infrared. Candidate YSOs toward IC 1396 indicating excess emission in the near-infrared were employed to verify the validity of the new source selection criteria defined based on C-C diagrams compiled with the 2MASS and AKARI data. Optical spectroscopy and spectral energy distributions of the IC 1396 sample yield a clear identification of the YSOs and further confirm the criteria defined for exploring the nature and properties of unknown excess emission sources in the infrared without optical identification. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000317329100010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5894]  |
| 专题 | 国家天文台_应用天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Alaska Anchorage, Anchorage, AK 99508 USA 3.Univ Nacl San Juan, Observ Astron Felix Aguilar, San Juan, Argentina |
| 推荐引用方式 GB/T 7714 | Huang, Ya Fang,Li, Jin Zeng,Rector, Travis A.,et al. EFFICIENT SELECTION AND CLASSIFICATION OF INFRARED EXCESS EMISSION STARS BASED ON AKARI AND 2MASS DATA[J]. ASTRONOMICAL JOURNAL,2013,145(5). |
| APA | Huang, Ya Fang,Li, Jin Zeng,Rector, Travis A.,&Mallamaci, Carlos C..(2013).EFFICIENT SELECTION AND CLASSIFICATION OF INFRARED EXCESS EMISSION STARS BASED ON AKARI AND 2MASS DATA.ASTRONOMICAL JOURNAL,145(5). |
| MLA | Huang, Ya Fang,et al."EFFICIENT SELECTION AND CLASSIFICATION OF INFRARED EXCESS EMISSION STARS BASED ON AKARI AND 2MASS DATA".ASTRONOMICAL JOURNAL 145.5(2013). |
入库方式： OAI收割
来源：国家天文台
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