Chemical Composition of Young Stars in the Leading Arm of the Magellanic System
文献类型：期刊论文
| 作者 | Zhang, Lan1,2,3 ; Bidin, Christian Moni4; Casetti-Dinescu, Dana I.5,6; Mendez, Rene A.3; Girard, Terrence M.7; Korchagin, Vladimir I.8; Vieira, Katherine9; van Altena, William F.9; Zhao, Gang1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2017-02-01 |
| 卷号 | 835期号:2 |
| 关键词 | stars: abundances stars: early-type stars: kinematics and dynamics |
| 英文摘要 | Chemical abundances of eight O-and B-type stars are determined from high-resolution spectra obtained with the MIKE instrument on the Magellan. 6.5 m Clay telescope. The sample is selected from 42 candidates for membership in the Leading Arm (LA) of the Magellanic System. Stellar parameters are measured by two independent grids of model atmospheres and analysis procedures, confirming the consistency of the stellar parameter results. Abundances of seven elements ( He, C, N, O, Mg, Si, and S) are determined for the stars, as are their radial velocities and estimates of distances and ages. Among the seven B-type stars analyzed, the five that have radial velocities compatible with membership of the LA have an average [Mg/H] of -0.42 +/- 0.16, significantly lower than the average of the remaining two, [Mg/H] = -0.07 +/- 0.06, which are kinematical members of the Galactic disk. Among the five LA members, four have individual [Mg/H] abundance compatible with that in the LMC. Within errors, we cannot exclude the possibility that one of these stars has an [Mg/H] consistent with the more metal-poor, SMC-like material. The remaining fifth star has an [Mg/H] close to Milky Way values. Distances to the LA members indicate that they are at the edge of the Galactic disk, while ages are of the order of similar to 50-70 Myr, lower than the dynamical age of the LA, suggesting a single star-forming episode in the LA. V-LSR of the LA members decreases with decreasing Magellanic longitude, confirming the results of previous LA gas studies. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | BLANKETED MODEL ATMOSPHERES ; HORIZONTAL-BRANCH STARS ; MILKY-WAY DISK ; O-TYPE STARS ; PROPER-MOTION ; STELLAR EVOLUTION ; CLOSE BINARIES ; DATA RELEASE ; STREAM ; CLOUDS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000401225600006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8778]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 2.CAS South Amer Ctr Astron, Camino Observ 1515, Santiago, Chile 3.Univ Chile, Dept Astron, Camino Observ 1515, Santiago, Chile 4.Univ Catolica Norte, Inst Astron, Av Angomos 0610, Antofagasta, Chile 5.Southern Connecticut State Univ, Dept Phys, 501 Crescent St, New Haven, CT 06515 USA 6.Yale Univ, Dept Astron, 260 Whitney Ave, New Haven, CT 06511 USA 7.14 Dunn Rd, Hamden, CT 06518 USA 8.Southern Fed Univ, Inst Phys, Stachki St 194, Rostov Na Donu 344090, Russia 9.Ctr Invest Astron, Apartado Postal 264, Merida 5101A, Venezuela |
| 推荐引用方式 GB/T 7714 | Zhang, Lan,Bidin, Christian Moni,Casetti-Dinescu, Dana I.,et al. Chemical Composition of Young Stars in the Leading Arm of the Magellanic System[J]. ASTROPHYSICAL JOURNAL,2017,835(2). |
| APA | Zhang, Lan.,Bidin, Christian Moni.,Casetti-Dinescu, Dana I..,Mendez, Rene A..,Girard, Terrence M..,...&Zhao, Gang.(2017).Chemical Composition of Young Stars in the Leading Arm of the Magellanic System.ASTROPHYSICAL JOURNAL,835(2). |
| MLA | Zhang, Lan,et al."Chemical Composition of Young Stars in the Leading Arm of the Magellanic System".ASTROPHYSICAL JOURNAL 835.2(2017). |
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来源：国家天文台
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