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The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits

文献类型：期刊论文

作者Zhang, Lan6; Casetti-Dinescu, Dana I.7,8,9; Moni Bidin, Christian10; Mendez, Rene A.5; Girard, Terrence M.1; Vieira, Katherine2; Korchagin, Vladimir I.3; van Altena, William F.4; Zhao, Gang6
刊名ASTROPHYSICAL JOURNAL
出版日期2019-01-20
卷号871期号:1页码:20
关键词stars: abundances stars: early-type stars: kinematics and dynamics
ISSN号0004-637X
DOI10.3847/1538-4357/aaf560
英文摘要We explore the origins of the young B-type stars found by Casetti-Dinescu et al. at the outskirts of the Milky Way disk in the sky region of the Leading Arm of the Magellanic Stream. High-resolution spectroscopic observations made with the MIKE instrument on the Magellan Clay 6.5 m telescope for nine stars are added to the previous sample analyzed by Zhang et al. We compile a sample of 15 young stars with well-determined stellar types, ages, abundances, and kinematics. With proper motions from Gaia DR2 we also derive orbits in a realistic Milky Way potential. We find that our previous radial-velocity-selected Leading Arm candidates have substantial orbital angular momentum. The substantial amount of rotational component for these stars is in contrast with the near-polar Magellanic orbit, thus making it unlikely that these stars are members of the Leading Arm. There are four large-orbital-energy stars in our sample. The star with the highest orbital energy has an age shorter than the time to disk crossing, with a birthplace z = 2.5 kpc and R-GC similar to 28 kpc. Therefore, the origin of this star is uncertain. The remaining three stars have disk runaway origins with birthplaces between 12 and 25 kpc from the Galactic center. Also, the most energetic stars are more metal-poor ([Mg/H] = -0.50 +/- 0.07) and have larger He scatter (sigma([He/H]) = 0.72) than the inner-disk ones ([Mg/H] = 0.12 +/- 0.36, sigma([He/H]) = 0.15). While the former group's abundance is compatible with that of the Large Magellanic Cloud, it could also reflect the metallicity gradient of the Milky Way disk and the group; s runaway status via different runaway mechanisms.
WOS关键词HORIZONTAL-BRANCH STARS ; HIGH-RESOLUTION SPECTROSCOPY ; EVOLUTION ; CLOUD ; MASS ; METALLICITY ; PARAMETERS ; PHOTOMETRY ; ROTATION ; CLUSTERS
资助项目National Science Foundation of China (NSFC)[11333003] ; National Science Foundation of China (NSFC)[11390372] ; NSFC[11773033] ; NSFC[11573040] ; NSFC[11673030] ; NASA[80NSSC18K0422] ; project FONDECYT[1170854] ; project FONDECYT[1150060] ; CONICYT[BASAL AFB-170002] ; RSF[18-12-00213] ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000456837000048
出版者IOP PUBLISHING LTD
资助机构National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; NSFC ; NSFC ; NASA ; NASA ; project FONDECYT ; project FONDECYT ; CONICYT ; CONICYT ; RSF ; RSF ; National Development and Reform Commission ; National Development and Reform Commission ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; NSFC ; NSFC ; NASA ; NASA ; project FONDECYT ; project FONDECYT ; CONICYT ; CONICYT ; RSF ; RSF ; National Development and Reform Commission ; National Development and Reform Commission ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; NSFC ; NSFC ; NASA ; NASA ; project FONDECYT ; project FONDECYT ; CONICYT ; CONICYT ; RSF ; RSF ; National Development and Reform Commission ; National Development and Reform Commission ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; NSFC ; NSFC ; NASA ; NASA ; project FONDECYT ; project FONDECYT ; CONICYT ; CONICYT ; RSF ; RSF ; National Development and Reform Commission ; National Development and Reform Commission
源URL[http://ir.bao.ac.cn/handle/114a11/24673]  
专题中国科学院国家天文台
通讯作者Zhang, Lan
作者单位1.14 Dunn Rd, Hamden, CT 06518 USA
2.Ctr Invest Astron, Apartado Postal 264, Merida 5101A, Venezuela
3.Southern Fed Univ, Inst Phys, Stachki St 194, Rostov Na Donu 344090, Russia
4.Yale Univ, Dept Astron, 260 Whitney Ave, New Haven, CT 06511 USA
5.Univ Chile, Dept Astron, Casilla 36-D, Santiago, Chile
6.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China
7.Southern Connecticut State Univ, Dept Phys, 501 Crescent St, New Haven, CT 06515 USA
8.Romanian Acad, Astron Inst, Str Cutitul Argint 5, Bucharest, Romania
9.Yale Sch Med, Radiol & Biomed Imaging, 300 Cedar St, New Haven, CT 06519 USA
10.Univ Catolica Norte, Inst Astron, Ave Angomos 0610, Antofagasta, Chile
推荐引用方式
GB/T 7714		 Zhang, Lan,Casetti-Dinescu, Dana I.,Moni Bidin, Christian,et al. The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits[J]. ASTROPHYSICAL JOURNAL,2019,871(1):20.
APA Zhang, Lan.,Casetti-Dinescu, Dana I..,Moni Bidin, Christian.,Mendez, Rene A..,Girard, Terrence M..,...&Zhao, Gang.(2019).The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits.ASTROPHYSICAL JOURNAL,871(1),20.
MLA Zhang, Lan,et al."The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits".ASTROPHYSICAL JOURNAL 871.1(2019):20.

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