Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE
文献类型：期刊论文
| 作者 | Tang, Baitian2; Cohen, Roger E.2; Geisler, Doug2; Schiavon, Ricardo P.3; Majewski, Steven R.4; Villanova, Sandro2; Carrera, Ricardo5; Zamora, Olga5; Garcia-Hernandez, D. A.5; Shetrone, Matthew6 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-02-11 |
| 卷号 | 465期号:1页码:19-31 |
| ISSN号 | 0035-8711 |
| 关键词 | Stars: Abundances Stars: Evolution Galaxy: Bulge Globular Clusters: Individual: Ngc 6553 |
| DOI | 10.1093/mnras/stw2739 |
| 英文摘要 | Multiple populations revealed in globular clusters (GCs) are important windows to the formation and evolution of these stellar systems. The metal-rich GCs in the Galactic bulge are an indispensable part of this picture, but the high optical extinction in this region has prevented extensive research. In this work, we use the high-resolution near-infrared (NIR) spectroscopic data from Apache Point Observatory Galactic Evolution Experiment (APOGEE) to study the chemical abundances of NGC 6553, which is one of the most metal-rich bulge GCs. We identify 10 red giants as cluster members using their positions, radial velocities, iron abundances, and NIR photometry. Our sample stars show a mean radial velocity of -0.14 +/- 5.47 km s(-1), land a mean [Fe/H] of -0.15 +/- 0.05. We clearly separate two populations of stars in C and N in this GC for the first time. NGC 6553 is the most metal-rich GC where the multiple stellar population phenomenon is found until now. Substantial chemical variations are also found in Na, O, and Al. However, the two populations show similar Si, Ca, and iron-peak element abundances. Therefore, we infer that the CNO, NeNa, and MgAl cycles have been activated, but the MgAl cycle is too weak to show its effect on Mg. Type Ia and Type II supernovae do not seem to have significantly polluted the second generation stars. Comparing with other GC studies, NGC 6553 shows similar chemical variations as other relatively metal-rich GCs. We also confront current GC formation theories with our results, and suggest possible avenues for improvement in the models. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000393782000002 |
| 源URL | [http://119.78.226.72/handle/331011/32655]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Tang, Baitian |
| 作者单位 | 1.Univ Antofagasta, Unidad Astron, Ave Angamos 601, Antofagasta 1270300, Chile 2.Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile 3.Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England 4.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA 5.Inst Astrofis Canarias, E-38205 Tenerife, Spain 6.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 7.Texas Christian Univ, Dept Phys & Astron, Ft Worth, TX 76129 USA 8.Univ Andres Bello, Dept Ciencias Fis, Av Republ 220, Santiago 13114, Chile 9.Univ Franche Comte, OSU THETA Franche Comte Bourgogne, Observ Besancon, Inst Utinam,CNRS UMR 6213, BP F-1615, F-25010 Besancon, France 10.Univ Chile, Av Libertador Bernardo OHiggins 1058, Santiago 13114, Chile |
| 推荐引用方式 GB/T 7714 | Tang, Baitian,Cohen, Roger E.,Geisler, Doug,et al. Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,465(1):19-31. |
| APA | Tang, Baitian.,Cohen, Roger E..,Geisler, Doug.,Schiavon, Ricardo P..,Majewski, Steven R..,...&Simmons, Audrey.(2017).Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,465(1),19-31. |
| MLA | Tang, Baitian,et al."Two groups of red giants with distinct chemical abundances in the bulge globular cluster NGC 6553 through the eyes of APOGEE".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 465.1(2017):19-31. |
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来源：上海天文台
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