THE K GIANT STARS FROM THE LAMOST SURVEY DATA. I. IDENTIFICATION, METALLICITY, AND DISTANCE
文献类型：期刊论文
| 作者 | Liu, Chao1 ; Deng, Li-Cai1; Carlin, Jeffrey L.2; Smith, Martin C.3; Li, Jing1,3; Newberg, Heidi Jo2; Gao, Shuang1; Yang, Fan1; Xue, Xiang-Xiang4; Xu, Yan1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-08-01 |
| 卷号 | 790期号:2 |
| 关键词 | Galaxy: halo Galaxy: structure stars: abundances stars: distances stars: individual (K giants) |
| 英文摘要 | We present a support vector machine classifier to identify the K giant stars from the LAMOST survey directly using their spectral line features. The completeness of the identification is about 75% for tests based on LAMOST stellar parameters. The contamination in the identified K giant sample is lower than 2.5%. Applying the classification method to about two million LAMOST spectra observed during the pilot survey and the first year survey, we select 298,036Kgiant candidates. The metallicities of the sample are also estimated with an uncertainty of 0.13 similar to 0.29 dex based on the equivalent widths of Mgb and iron lines. A Bayesian method is then developed to estimate the posterior probability of the distance for the K giant stars, based on the estimated metallicity and 2MASS photometry. The synthetic isochrone-based distance estimates have been calibrated using 7 globular clusters with a wide range of metallicities. The uncertainty of the estimated distance modulus at K = 11 mag, which is the median brightness of the K giant sample, is about 0.6 mag, corresponding to similar to 30% in distance. As a scientific verification case, the trailing arm of the Sagittarius stream is clearly identified with the selected K giant sample. Moreover, at about 80 kpc from the Sun, we use our K giant stars to confirm a detection of stream members near the apo-center of the trailing tail. These rediscoveries of the features of the Sagittarius stream illustrate the potential of the LAMOST survey for detecting substructures in the halo of the Milky Way. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339115800027 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6440]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Max Planck Inst Astron, D-69117 Heidelberg, Germany 5.Univ Sci & Technol China, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Chao,Deng, Li-Cai,Carlin, Jeffrey L.,et al. THE K GIANT STARS FROM THE LAMOST SURVEY DATA. I. IDENTIFICATION, METALLICITY, AND DISTANCE[J]. ASTROPHYSICAL JOURNAL,2014,790(2). |
| APA | Liu, Chao.,Deng, Li-Cai.,Carlin, Jeffrey L..,Smith, Martin C..,Li, Jing.,...&Jin, Ge.(2014).THE K GIANT STARS FROM THE LAMOST SURVEY DATA. I. IDENTIFICATION, METALLICITY, AND DISTANCE.ASTROPHYSICAL JOURNAL,790(2). |
| MLA | Liu, Chao,et al."THE K GIANT STARS FROM THE LAMOST SURVEY DATA. I. IDENTIFICATION, METALLICITY, AND DISTANCE".ASTROPHYSICAL JOURNAL 790.2(2014). |
入库方式： OAI收割
来源：国家天文台
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