THE FREQUENCY OF FIELD BLUE-STRAGGLER STARS IN THE THICK DISK AND HALO SYSTEM OF THE GALAXY
文献类型：期刊论文
| 作者 | Santucci, Rafael M.1; Placco, Vinicius M.2; Rossi, Silvia1; Beers, Timothy C.3,4; Reggiani, Henrique M.1; Lee, Young Sun5; Xue, Xiang-Xiang6,7; Carollo, Daniela8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-03-10 |
| 卷号 | 801期号:2 |
| 关键词 | binaries: close blue stragglers Galaxy: halo line: profiles stars: horizontal-branch techniques: radial velocities |
| 英文摘要 | We present an analysis of a new, large sample of field blue-straggler stars (BSSs) in the thick disk and halo system of the Galaxy, based on stellar spectra obtained during the Sloan Digital Sky Survey (SDSS) and the Sloan Extension for Galactic Understanding and Exploration (SEGUE). Using estimates of stellar atmospheric parameters obtained from application of the SEGUE Stellar Parameter Pipeline, we obtain a sample of some 8000 BSSs, which are considered along with a previously selected sample of some 4800 blue horizontal-branch (BHB) stars. We derive the ratio of BSSs to BHB stars, F-BSS/BHB, as a function of Galactocentric distance and distance from the Galactic plane. The maximum value found for F-BSS/BHB is similar to 4.0 in the thick disk (at 3 kpc < vertical bar Z vertical bar < 4 kpc), declining to on the order of similar to 1.5-2.0 in the inner-halo region; this ratio continues to decline to similar to 1.0 in the outer-halo region. We associate a minority of field BSSs with a likely extragalactic origin; at least 5% of the BSS sample exhibit radial velocities, positions, and distances commensurate with membership in the Sagittarius Stream. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350965500045 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5742]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508900 Sao Paulo, SP, Brazil 2.Gemini Observ, Hilo, HI 96720 USA 3.Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA 4.Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA 5.Chungnam Natl Univ, Dept Astron & Space Sci, Taejon 305764, South Korea 6.Max Planck Inst Astron, D-69117 Heidelberg, Germany 7.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 8.Osservatorio Astrofis Torino, INAF, I-10020 Turin, Italy |
| 推荐引用方式 GB/T 7714 | Santucci, Rafael M.,Placco, Vinicius M.,Rossi, Silvia,et al. THE FREQUENCY OF FIELD BLUE-STRAGGLER STARS IN THE THICK DISK AND HALO SYSTEM OF THE GALAXY[J]. ASTROPHYSICAL JOURNAL,2015,801(2). |
| APA | Santucci, Rafael M..,Placco, Vinicius M..,Rossi, Silvia.,Beers, Timothy C..,Reggiani, Henrique M..,...&Carollo, Daniela.(2015).THE FREQUENCY OF FIELD BLUE-STRAGGLER STARS IN THE THICK DISK AND HALO SYSTEM OF THE GALAXY.ASTROPHYSICAL JOURNAL,801(2). |
| MLA | Santucci, Rafael M.,et al."THE FREQUENCY OF FIELD BLUE-STRAGGLER STARS IN THE THICK DISK AND HALO SYSTEM OF THE GALAXY".ASTROPHYSICAL JOURNAL 801.2(2015). |
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来源：国家天文台
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